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Or a circumstantial "Summon" spell, that would summon a different creature based on what it is cast upon.

Imp Dust -> Imp

Wisp Dust -> Wisp

Unicorn Horn -> Nightmare

Tree -> Ent

Stone -> Golem

The "Reanimate" spell would also be much more interesting if it were circumstantial, generating a different type of undead based on the corpse used.