Vuela; Eco (Al comienzo de tu proximo mantenimiento despues de que este permanente entra bajo tu control, sacrificalo a menos que pagues su conste de mana.)

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Flying; echo (At the beginning of your next upkeep after this permanent comes under your control, sacrifice it unless you pay its mana cost.)

When Bone Shredder comes into play, destroy target nonartifact, nonblack creature.