dumbledore

Eminence— Whenever you cast a Wizard spell or a noncreature spell, create a Clue token. This spell costs {1} less to cast for each Wizard you control. Sacrifice a Clue: Put a -1/-1 counter on Dumbledore. Each opponent sacrifices a creature. When Dumbledore dies, move any number of -1/-1 counters from it onto other target creatures.