Bloodsoaked Altar

Six mana up front, and then it charges you again every time you want to use it: two life, a card from hand, and a creature already on the battlefield, all to net a single 5/5 flier. The rate is deliberately punishing, and the reason is the ceiling it protects against. This is a repeatable creature-into-creature converter, the kind of engine that turns any sacrifice fodder into evasive beef turn after turn, and unbounded token generation of that size is exactly what design has to fence in. So the fence is stacked: a heavy cost to deploy, a sorcery-speed lock so it never ambushes at instant speed, and a three-part activation tax that makes each Demon a real decision rather than a reflex. The result reads less like a payoff and more like a slow black value spine: something that wants a wide board of expendable bodies, a graveyard-friendly discard, and enough life to spend without flinching. It sits in the aristocrats tradition where creatures are currency, but where most of those cards convert death into small incremental drains, this one converts it into a five-power evasive threat, trading breadth of triggers for size of output. The demand it makes of a deck is total: build around the fodder and the recursion, or leave it in the binder.