Phyrexian Ghoul

The free sacrifice outlet is what gives this card its quiet utility: no mana, no tap, no limit on how many creatures you feed it in a turn. That distinction matters more than the modest pump suggests. Sacrifice effects that cost mana to activate compete with the rest of your turn; this one only costs the creatures themselves, which makes it a repeatable engine for any deck that wants bodies to leave the battlefield on its own terms. Feeding it tokens or creatures with death triggers turns a pile of expendable fodder into either a one-shot lethal swing or a way to dump value before a board wipe lands. The +2/+2 itself is incidental; the real product is permission to sacrifice at instant speed, as often as you like, with the size boost as a place to put the proceeds. It reads as a beater that grows, but it functions as a sacrifice altar wearing a creature's body, predating the dedicated free outlets that later took over the role: Carrion Feeder asks for a counter, Viscera Seer trades for scry, Goblin Bombardment redirects the payoff to damage. Each refined the template; this one set the rate by charging nothing but the creatures.