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Flash keeps the bodies, and both battlefields go with them

Issue #350 (a slice of #200), 2026-10-14. Constructed, Duel (485). Rules version 2026-07-16. Card text verbatim from data/corpus_flat.txt; rules pasted from data/Riftbound-Core-Rules-2026-07-16.txt. Read the unopposed clock for the baseline this is measured against.

Subject: flash-gem-jammer-move-both-ways, the Fury/Chaos ENGINE in which SFD-007 Gem Jammer gives a unit [Ganking] for one battlefield-to-battlefield trip on your turn, and OGS-011 Flash, a [Reaction], pulls two units back to base on theirs, out of reach of OGN-133 Flurry of Blades. Walked as a game, both halves worked. On your T3 the Jammer's grant sent a unit from your battlefield into theirs, and you conquered it while still holding yours. On their T3 Flash took both your units off the board before the Flurry resolved, and both survived. Two things the entry does not walk decide the line. The Ganking trip empties the battlefield it leaves, and only a second unit already standing there when the trip leaves keeps it. And Flash pulled one unit from each battlefield, so it gave up both battlefields, not one. They walked into an empty one and conquered it.

Why this line. scripts/sequence-pick.mjs --unplayed, re-run on 2026-10-14 at 3ff0f0b, reads 773 entries, 262 with forced-ordering language, 102 in the queue and 37 of them with no play, unchanged from the issue. The pick is by global rank, skipping entries that already have a play: this entry is rank 65 (a hit on before), first in the list. The other entry of this slice is rank 66, OGN-279 Fortified Position granting [Shield 2] to UNL-036 Mutated Mouser, played in Fortified Position holds the battlefield, and one Flurry before the attack takes it.

1. Needs

Legendany Fury/Chaos legend (103.1.b.2); here OGN-251 Loose Cannon
The tripSFD-007 Gem Jammer (Fury unit, E2, M2)
The retreatOGS-011 Flash (Chaos spell, E2, [Reaction])
The bodiesOGN-003 Chemtech Enforcer (Fury, E2, M2) and SFD-130 Treasure Hunter (Chaos, E2, M1)

Neither entry card is Signature (data/cards.json), and neither is in data/legality.src.json. Gem Jammer is Fury and Flash is Chaos, so the deck needs both domains.

The card text the play turns on:

2. What each half can do, and when

The trip is a Standard Move, on your turn. 144.4.a: "Units may move from their Base to a Battlefield." 144.4.b: "Units may move from a Battlefield to their Base." There is no third option without the keyword. 144.4.c.1: "Units with Ganking may use their Standard Move to Move from Battlefield to Battlefield." 810.1.c.3 says the grant adds no second move: "It does not give additional abilities or activations of Movement, only new options for the Standard Move." So the Jammer saves exactly one leg. A unit at your battlefield reaches theirs this turn instead of next.

The trip empties the battlefield it leaves. 323.6: "Players lose control of any controlled Battlefields without their Units occupying them if the turn is in an Open State and there is no Showdown or Combat ongoing there." If the unit that makes the trip was your only unit there, the battlefield is gone at the next cleanup, and the cleanup comes straight after the move (319.8). A simultaneous move does not help. 144.3 lets several units move as one action, but 144.3.a: "When a Move like this is declared by a player, the units' Destination must be the same." A unit leaving A for B and a unit walking from base to A have different destinations, so they are two moves. The second unit has to walk in first, with its own Standard Move. Then the trip leaves, and the cleanup after it finds a unit of yours still at A. In the other order, the cleanup after the trip runs 323.6 at A before the second unit arrives.

The retreat is a [Reaction], on any turn. 813.1.c.1: "This can be played during Closed States on any player's turn." Flurry of Blades is also a [Reaction] and chooses nothing, "Deal 1 to all units at battlefields" (355.10.d). When they cast it, Flash goes on the chain above it. 340.1: "The newest Finalized Chain Item resolves." Your units are in base before the Flurry resolves, and a base is not a battlefield. The rulebook walks this exact card at 359.3.e.5: "In reaction, that unit's controller plays Flash, moving the unit to their base."

A move made by a spell is still a move. 449: "Spells, Abilities, or other effects may cause a Move to occur." Treasure Hunter's "When I move" fires on Flash's move as it does on its own walk.

3. Their order: Fury/Body, bodies and one sweeper

OGN-249 Relentless Storm (Fury/Body): "When you play a [Mighty] unit, you may exhaust me to channel 1 rune exhausted." Nothing they play is Mighty, so it is idle. Its Chosen Champion carries the Volibear tag. They play UNL-092 Demacian Diplomat (Body, E2, M2, "When you play me, gain 1 XP."), UNL-097 Kinkou Initiate (Body, E3, M3, "When you play me, draw 1 if your other units have total Might 5 or more.") and OGN-130 Crackshot Corsair (Body, E3, M3). Their hand holds OGN-133 Flurry of Blades (Body, E1): "[Reaction] (Play any time, even before spells and abilities resolve.) Deal 1 to all units at battlefields."

4. The turns, going first

Fury/Chaos against Fury/Body. Your opening four are Chemtech Enforcer, Treasure Hunter, Gem Jammer and Flash. Every card either side plays in the walk costs Energy only, so neither rune deck's split matters to it. A is your battlefield and B is theirs.

turn    runes   your turn                                                 points
T1      2       Chemtech Enforcer (E2) to base; discard the card drawn    0
                this turn.
their T1        Demacian Diplomat (E2) to base, 1 XP. Three runes, one
                left.
T2      4       Chemtech Enforcer walks to A, Conquer: +1. Treasure       1
                Hunter (E2) to base. Two runes left.
their T2        Diplomat walks to B, Conquer. Kinkou Initiate (E3) to
                base; their other units total 2, no draw. Five runes,
                two left.
T3      6       Hold A: +1. Treasure Hunter walks base to A (Gold         3
                token). Gem Jammer (E2) to base: Ganking on the
                Enforcer at A. Then the Enforcer walks A to B. At B, 4
                against the Diplomat's 2. Conquer B: +1. Four runes
                left.
their T3        Flurry of Blades (E1). In response, Flash (E2): the
                Enforcer and Treasure Hunter to base (Gold token). The
                Flurry hits no one. Cleanup: A and B both uncontrolled.
                Kinkou Initiate walks to A, Conquer. Crackshot Corsair
                (E3) to base. Seven runes, three left.
T4      8       Treasure Hunter walks to B, Conquer: +1 (Gold token).     5
                The Enforcer and Gem Jammer walk to A: 4 + 2 against
                Kinkou's 3. Conquer A: +1.

Their points: 0 after their T1, 1 after their T2, 2 after their T3. After your T4 it is 5 to 2.

Why they did not attack A on their T2. The Diplomat's 2 against the Enforcer's 2 on defence kill each other, and 466.5.b leaves the battlefield uncontrolled: "If there are no Units remaining here controlled by any player, the Battlefield becomes Uncontrolled." That is no point for a body. B was empty and worth a Conquer. A Flurry on their T2 kills nothing: the Enforcer and the Diplomat are both 2.

Your T3, the trip. The Enforcer has been at A since T2 and readied in your Awaken (315.1.b), so the Jammer's grant goes on it. Without the grant its only move is back to base (144.4.b), and B is a turn away. Treasure Hunter, in base since T2, walks to A first, with its own Standard Move, and its trigger makes a Gold token. Only then does the Enforcer leave, so the cleanup after the trip finds Treasure Hunter at A and A is still yours (§2). At B the Enforcer is an attacker: 807.1.c, "While I am an attacker, I have +X [M]." 465.2.c: "Starting with the Attacker, each player assigns an amount of damage equal to their summed Might among the other's Units." Its 4 kill the 2-Might Diplomat. The Diplomat's 2 on a 4 are not lethal (142.4.b), and the Combat Cleanup heals it (466.1.a.1). You conquer B and still control A.

They had two ready runes and the Flurry through your T3. Cast then, it kills Treasure Hunter at A and does not change the fight at B. §5 walks it.

Their T3, the retreat. Before they attack anything they cast Flurry of Blades in their Main Phase. Treasure Hunter is a 1 at A and dies to it. The Enforcer is a 2 at B and takes 1, and Kinkou Initiate's 3 would kill it when it defends B. You cast Flash in response and choose both. Flash resolves first (340.1): both go to base, and Treasure Hunter's trigger makes a second Gold token. The Flurry resolves with no unit of either player at a battlefield, since all of theirs are in base. The chain empties, and the cleanup in the Open State that follows applies 323.6 to both battlefields: you lose A and B. Kinkou Initiate walks into A unopposed. 466.5.d: "Establishing Control results in a Conquer if that player has not yet scored this Battlefield this turn."

What Flash bought. Without it the same turn costs you both bodies. The Flurry kills Treasure Hunter, and A is lost all the same, because nothing of yours is left there. Kinkou Initiate attacks B: 3 against the Enforcer's 2 with 1 already marked, so the Enforcer dies, and their 3-Might body takes 2 and lives. They conquer B. It is 3 to 2 either way. With Flash you start T4 with Treasure Hunter, the Enforcer and Gem Jammer in base, and two Gold tokens. Without it you start with Gem Jammer alone, take one battlefield on T4, and it is 4 to 2 instead of 5 to 2.

The ground was the price, and it was both battlefields. "Up to 2" let Flash take one unit from each battlefield, and each was your last unit there. One Flash emptied two battlefields, and they conquered one of them unopposed.

How often this happens. The draw pile is 39 cards, the 40 of Tournament Rules 601.1.b less the Chosen Champion, which 103.2.a.1 places in the Champion Zone. Going first you have seen 5 cards by T1, 6 by T2 and 7 by T3 (four opening, one draw a turn), and still 7 on their T3. The walk's line, at three copies of each, needs an Enforcer by T1, a Treasure Hunter by T2, and a Gem Jammer and a Flash by T3: 1.50%. A Gem Jammer and a Flash both by T3 alone is 19.23%. An Enforcer on T1 alone is 34.52%. Their Flurry, three copies in a 39-card pile, is in hand by their T3 (7 cards seen) in 45.73%.

5. Breaks to

The cheapest break is a second OGN-133 Flurry of Blades, E1, cast in response to Flash. The chain resolves newest first (340.1). The second Flurry resolves before Flash: Treasure Hunter dies, and the Enforcer takes 1. Flash then moves the Enforcer alone. 359.3.e.8: "the instruction will execute, with only the Targets available and valid being operated on." The first Flurry hits no one. You lose Treasure Hunter, which is what Flash was cast to save, and both battlefields as before. Kinkou Initiate still conquers A. It costs them one more Energy and a second copy: two or more of three Flurries in the first 7 cards of 39 is 7.74%.

The scope of that verdict. A Fury/Body deck can play only Fury, Body and Fury/Body cards (103.1.b.1). Of the cards in data/corpus_flat.txt that counter a spell or an ability, the only one in those domains is UNL-106 Repulse (Body, E1 + 1 Power): "Choose a friendly unit at a battlefield. Counter an enemy spell or ability that chooses it and no other friendly unit." Flash chooses only your units, never one of theirs, so Repulse cannot reach it. Two cards in those domains say can't move. UNL-111 Determined Sentry (Body, E1, M1) reads "I can't move to base." and binds only itself. SFD-014 Minotaur Reckoner (Fury, E5, M5) reads "Units can't move to base.", and 054.1 makes the prohibition win: "Cards that forbid actions or effects, as a broad method of determination, supersede cards that allow or permit that same action or effect." With the Reckoner on the board, Flash's move is ignored (359.3.e.6) and the Flurry kills Treasure Hunter. But a unit goes to the chain when it is played (354), and Flash can be cast in response to the Reckoner itself, before it resolves. So the Reckoner breaks the line only if it is already on the board, for E5, before Flash is needed. The last way to break it is to kill Treasure Hunter at [Reaction] speed in response to Flash. In those domains that is OGN-033 Shakedown (Fury, E2 + 1 Power, [Reaction]): "Choose an enemy unit. Deal 6 to it unless its controller has you draw 2." It costs more than a Flurry, and you can let them draw 2 instead. The [Hidden] SFD-017 Sudden Storm and UNL-003 Mischievous Marai and the [Ambush] UNL-021 Grim Apothecary and VEN-017 Morgana, Vindictive are not available at that moment. They hold no battlefield and have no unit at one when the Flurry is cast. Anything they had hidden at B was trashed by 323.7 when you conquered it on T3. That leaves the second Flurry as the cheapest break in those domains.

Cast on your turn, the same Flurry costs you the same. On your T3 they have two ready runes. Cast in the combat at B, the Flurry kills Treasure Hunter at A, or Flash takes it to base. Either way A is empty, and 323.6 takes it at the first cleanup in an Open State with no Showdown or Combat there. At B the Enforcer is a 4 with 1 marked, and the Diplomat's 2 make 3, so it survives, and the Diplomat dies to 4 on a 2 with 1 marked. You still conquer B. It is the same trade as on their turn: Treasure Hunter or Flash, and A.

OGN-127 Cannon Barrage (Body, E2 + 1 Body Power, [Reaction]) reads "Deal 2 to all enemy units in combat." Your units are in combat only at B on your T3, where the Enforcer is a 4. It is not an answer to Flash.

6. Verdict

Right about both halves, short about the cost of the retreat, and silent about what the trip leaves behind. The Jammer's grant turned a two-turn trip into one and was worth a Conquer, but only because a second unit walked into the battlefield the first one left before the trip, not with it. Flash answered Flurry of Blades exactly as the entry says and kept two bodies. Pulling one unit from each of two battlefields cost both battlefields, and the opponent conquered one of them for free. The score was the same with or without Flash. The bodies were the whole gain.

7. Not verified

No card in the walk costs Power, so it rests on no rune-dealing assumption for either side, at any split. Of the breaks, Cannon Barrage needs one Body among the five runes they have on your T3; with six Body in their twelve the five hold none in 6 of 792 deals, 0.76%. The Reckoner and a second Flurry are Energy only.

I put Flurry of Blades in their hand, and a second copy in §5's break, and did not price either beyond the draw figures. I did not walk the T1 discard beyond "the card drawn this turn", Loose Cannon's draw in a turn where your hand falls to one, the mulligan, or 2v2. The probabilities in §4 count only cards in hand at the turn named.

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