Scourge of Skola Vale

The activated ability is the whole engine, and it converts the wrong number on purpose. Most sacrifice-for-counters effects pay out on the dead creature's power: you eat your attacker, you grow by its punch. This one pays on toughness, which quietly rewrites which creatures you want to feed it. The fat defensive wall that contributed nothing to the offense becomes the best fuel in the deck, and a chump blocker cashed out mid-combat hands its full butt over as permanent growth. Because the ability is untap-gated only by the tap symbol and carries no sorcery-speed restriction, it works at instant speed: hold up the activation, let a creature block or get pointed at by removal, and sacrifice it in response so the toughness lands on a body that survives. Trample is the payoff clause that keeps the math honest, since stacking eight or ten counters onto a single attacker means nothing if a 1/1 can wall it; here the excess spills through. The cost is that it arrives as a fragile two-counter body that does nothing until you have a board to dismantle, which makes it a engine that wants a graveyard-and-aristocrats shell already in motion rather than a card you cast on curve and trust.