The Night Market's King

Masked — This creature enters the battlefield with a Mask token, a colorless aura
that says "When enchanted creature leaves the battlefield it gains the creature type of your choice for all affects that would trigger when
that creature type leaves the battlefield."

When a creature an opponent controls dies as a result of a spell you cast you return it to the battlefield under your control as a 0/4 cage that says when this card leaves the battlefield make 2 treasure tokens.