Altar of Bone

A creature tutor priced like a creature trade: two mana and a body on the battlefield buys you the exact creature you want in hand. The math is deliberately even. You sacrifice one to fetch one, and the new creature arrives in hand rather than in play, so the spell costs you both a tempo step and a card-economy step. That symmetry is what stops a green-white tutor from being a free dig: it does not generate advantage, it transmutes it, trading a creature you can spare for one you cannot afford to draw into randomly. Because this is a sorcery, the sacrifice is paid on your own turn, which forecloses the instant-speed games that make additional-cost sacrifices so valuable elsewhere: you cannot feed a creature into the spell in response to removal. The fuel has to be something already expendable on your main phase: a token you no longer need, a creature whose enters-the-battlefield value you have already banked, a wall whose job is done. Read that way it is less a tutor than a recursion-adjacent filter, a way to convert a creature that has outlived its usefulness into one that has not yet been needed. It belongs to the family of effects that ask you to build around the cost rather than the result, paid in creatures, fetching creatures, living entirely on the battlefield.