Combo · ENGINE

Lilting Lullaby — the only counter in the pool that takes the rest of the opponent's turn with it, and the one card that reaches a Hold burst's window

1 card · calm + mind · verified

Pieces

• Lilting Lullaby ×1 UNL-190 · enabler · calm/mind

  [Reaction] (Play any time, even before spells and abilities resolve.) Counter a spell. Its controller can't play spells this turn.

Payoff

Deck

• UNL-190 Lilting Lullaby is a SIGNATURE card tagged Lillia, so 103.2.d.2 forces a Lillia legend that also covers calm + mind: UNL-189 Bashful Bloom — the only one. Domain-legal legends without the Lillia tag cannot run the list. (Rebuilt from the census by test/legend-lines.test.ts, 2026-09-07; an earlier line named legends that cannot hold a Lillia Signature card.)
• Two runes untapped when the opponent acts. That is the whole set-up; there is nothing to build.

Prerequisites

• IT IS UNIQUE, AND THE CLAIM SURVIVES A FULL GREP. All 14 lines of 'counter' in data/corpus_flat.txt were read end to end: 11 are counters, 3 are anti-counter text, and Lilting Lullaby is the ONLY one that adds a rider to the countered player's turn. OGN-064 Wind Wall is the same unconditional counter for one more Energy and no rider, so this card strictly dominates it at the price of a second domain.
• WHAT IT ESCORTS. The two BURSTs that score in a Hold and sit in Calm/Mind are ahri-blue-sentinel-hold and svellsongur-copy-hold, and each names surviving the opponent's turn as its one fragility in its own words - 'Five specific units must survive the opponent's whole turn' and 'killing Ahri or stripping her gear collapses the whole board'. This is the card that answers the removal spell that would do it.
• TWO WINDOWS, AND BOTH ARE REAL. On the opponent's turn their removal spell puts a Chain Item up, which is a Neutral Closed State (310.2); 312.2.c and 312.2.d hand you priority there, and 813.1.c.1 says a [Reaction] card 'can be played during Closed States on any player's turn'. In your OWN Beginning Phase the window exists only because the escorted entry's Hold trigger opens it: with an empty chain 335 gives nobody priority outside the Main Phase, and it is the trigger that creates the Chain.
• THE MANA IS FREE ONLY ON THE TURN THAT WINS, and pretending otherwise would be the honest error. 164.2.a ('[E]: [Reaction] - Add [1]') and 164.2.b ('Recycle this: [Reaction] - Add [C]') are both playable in a Closed State, and 164.2.b carries no exhaust in its cost, so TWO runes pay the 2 Energy and then the 2 Power - exhaust both, then recycle both. 164.2.b.1 makes the Power match the recycled rune's domain, so a Calm/Mind deck pays with a Calm rune and a Mind rune, and 161.2.b sends them to the Rune Deck, with 315.3.b channelling 2 back next turn. On a turn that WINS none of that costs anything, because 319.5 makes a Cleanup outstanding when the trigger leaves the Chain, 194.2 checks the win there, and the Main Phase task 167 / 316.3 that empties the Rune Pool never arrives. On a turn that does not win, a rune exhausted in the Beginning Phase stays exhausted through the Main Phase, since Awaken (315.1.b) is already past.
• WHAT GOES THROUGH IT, MEASURED. The lock says 'spells'. Untouched: the 10 [Reaction][>] activated abilities of the pool (UNL-018, UNL-049, UNL-073, UNL-093, UNL-145, UNL-185, UNL-197, UNL-T05, VEN-075, VEN-141); every Main-Phase activated ability of a permanent already on their board - a targeted sweep of the non-spell rows for a cost-then-kill ability finds at least ten (OGN-017, OGN-068, OGN-090, OGN-186, OGN-242, SFD-046, UNL-026, UNL-138, VEN-060, VEN-133), and that is a floor rather than a census; the 15 hidden units and 2 hidden gear, which are not spells; and playing tokens (350.2, 'Tokens are not cards, but can still be Played').
• WHAT REFUTES IT: it needs a spell to counter. If the opponent answers with an activated ability, Lilting Lullaby is a dead card in hand and there is no lock at all. It is an escort conditioned on how the opponent removes, not a wall.

Steps

1. Hold Lilting Lullaby and two runes through the opponent's turn. Do not spend either.
2. When they play the removal spell aimed at the Hold board, the Chain Item puts the turn in a Neutral Closed State (310.2) and 312.2.c/d give you priority.
3. Exhaust both runes for 2 Energy (164.2.a), then recycle both for 2 Power (164.2.b, 164.2.b.1) and play Lilting Lullaby as a [Reaction] (813.1.c.1).
4. The spell is countered and its controller plays no more spells for the rest of that turn.
5. The board survives to your Beginning Phase, where the escorted entry Holds. If they respond to that trigger, the same card works there - and on a winning turn the two runes cost nothing, because 319.5 plus 194.2 end the game before 167 / 316.3 would empty the pool.

How it ends

engine only - one enemy spell countered and the rest of that turn spell-less; it protects a scoring turn, it does not create one

Sources

Published elsewhere

• Denial lens hunt, issue #100 (rc-huntQ) 2026-09-06
• Riftbound Core Rules, Last Updated 2026-07-16 (data/Riftbound-Core-Rules-2026-07-16.txt) 2026-07-16

Walked here, in this project

• Hand walk 2026-09-06 2026-09-06 record

Walked against Core Rules 2026-07-16

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