Pyreheart Wolf

The combat math here is the whole engine: a single attacker that grants menace to your entire team turns a stalled board into a guaranteed alpha strike. Every creature you control demands two blockers, which on a developed board means most of them simply get through. A 1/1 that does nothing in a fight is exactly the body you want for the job, because the threat is the menace grant, not the wolf itself. Undying is the insurance that keeps the engine running: chump it into a bad block or let it trade, and it comes back bigger to do the same thing next turn, the counter both rewarding the sacrifice and shutting the loop off after one cycle. It is a go-wide payoff that asks almost nothing of its caster, the kind of attack-trigger anthem that punishes opponents for committing creatures to defense rather than to the race. The design lineage runs through every card that has tried to make a board of small red creatures lethal against a wall of blockers; this one solves it by attacking the blocking rules directly instead of buffing power. The tension it resolves is the classic aggro stall, where the beatdown deck has the wider board but cannot push damage through. Send the wolf in, and the stall is over.