Infernal Vessel

Killing this only makes it bigger. A 2/1 with no evasion invites the attack it can't survive, and that death is the point: it returns a 4/3 with two counters, now carrying the Demon type, and the return clause reads "if it wasn't a Demon." So the second death is a real one. That gate is the whole restraint. Strip the "if it wasn't a Demon" line and you have an infinite chump blocker and a bottomless sacrifice engine, both wildly underpriced; the type change is the counter that spends the loop after one use. What makes the design clever is that the same rider pulls double duty: it caps the recursion and it hands you a Demon for anything that rewards the tribe, converting a Human Cleric into fodder or payoff on its way out. It's a finality counter wearing a creature-type change, the flavor of a cultist consumed by the thing they summoned doing the mechanical work of "one comeback, then the graveyard keeps it." Sacrifice decks get a body that reloads exactly once; anyone who cares about Demons gets one for free the moment this dies. The elegance is in how the tribal rider and the recursion limiter are literally the same clause, so the payoff and the price are inseparable.