Threnody Singer

Devotion turned into a removal effect, but only the kind that shrinks power. The flash-flying body is fine curve filler on its own; the enters trigger is what makes the design specific. Because X counts every blue pip on the permanents you already control, the shrink is only as large as the board you've committed, which means the spell scales backward from the usual removal logic: it's weak when you're behind and strong when you're ahead, exactly when a subtractive effect matters least and yet reads most brutal in combat math. The -X/-0 clause is the tell. It never kills; it targets one attacker or blocker and neutralizes it for a turn, blanking a swing or letting a 1/3 eat something it has no business trading with. That restriction is what lets a two-mana creature carry a devotion payoff at all: point it at power alone and the effect stays a combat trick with a body attached, no matter how deep your blue count runs. Held up at instant speed, the trigger rewrites a single combat step rather than answering a threat for good, which is the honest ceiling on a shrink effect and the reason a creature this cheap can key off your whole board without warping anything. The comparison it invites is with hard removal, and it loses that comparison on purpose: a Siren that ambushes one creature for one turn, priced accordingly.