Kroxa, Titan of Death's Hunger

The self-sacrifice clause inverts the usual escape math. Cast for two mana, this is a one-shot discard-and-drain that immediately kills itself; the body never touches the battlefield in a way that matters. That front half is deliberately underwhelming: one card of discard, three life only if the opponent has no nonland to pitch, and then it dies. The card is priced as though its first appearance is a slightly-worse discard spell with a downside, because it is. What escape buys is not the 6/6 so much as the fact that it keeps coming back: exile five cards, pay the escape cost, and the same enter-the-battlefield trigger fires again, this time without the sacrifice. Every attack repeats the discard-and-drain on top of it, so a recurring Kroxa doubles as an attrition engine and a clock that is hard to answer permanently. Wrath it or edict it and it drops back into the bin, waiting for five more fuel; even bouncing it only buys a turn, since it returns to hand ready to be recast for its two-mana front half again. That structure makes it a strange hybrid of threat and resource: it turns a graveyard's worth of dead cards into ammunition, it punishes an empty hand harder than a full one, and it asks the pilot to treat their own bin as a mana source. Each Titan in the cycle carried a version of this back-from-the-dead tension, but this is the one built to grind: cheap enough to trade early, relentless enough to win the long game one card and three life at a time.