Razaketh, the Foulblooded
Demonic Tutor stapled to a body, then handed a throttle you control. The line that matters is not the 8/8 flier with trample; it is the activated ability, which converts creatures into library searches at the rate of one card fetched per body sacrificed, paid in two-life increments rather than mana. That last detail is the whole machine: because the cost is life and a creature rather than mana, the ability is unbounded within a turn. Given enough fodder and enough life to spend, you can assemble any combination of pieces from your deck into your hand in a single window, then deploy them once you stop tutoring. It is less a creature than a sacrifice engine that happens to fly. The design lineage runs through black's long tradition of paying life for unconditional card selection: Vampiric Tutor, Imperial Seal, the Demonic Tutor it descends from. Those are spells that resolve once; this one stays on the battlefield and repeats until the fodder or the life total runs out. The eight-mana cost and the legendary tag are the brakes: you get one, and getting it down means surviving to the back half of a game, where instant-speed activation lets it collect answers and combo pieces on an opponent's turn as readily as your own. What it asks for in return is a board willing to die.
