Jank, Undead Inspector

At the beginning of your end step, if an opponent lost life this turn, create at random one of this tokens: food, clue, blood or treasure.
Whenever you cast a white spell, target food becomes a 2/2 angel with flying and lifelink.
Whenever you cast a blue spell, target clue becomes a 2/2 spirit with flying and prowess.
Whenever you cast a black spell, target blood becomes a w/2 bat with flying and menace.
Whenever you cast a red spell, target treasure becomes a 3/3 gremlin with menace