Altar of Bone
Altar de Ossos
Altar de hueso
As an additional cost to cast this spell, sacrifice a creature. Search your library for a creature card, reveal that card, and put it into your hand. Then shuffle your library.
Players can only respond once this spell has been cast and all its costs have been paid. No one can try to destroy the creature you sacrificed to prevent you from casting this spell.
Because the “search” requires you to find a card with certain characteristics, you don’t have to find the card if you don’t want to.