Thriller Bark

({t}: Add {b} or {g})
As Thriller Bark enters the battlefield, you may discard a multicolores card. If you don't, it enters tapped and you lose 4 life.
Whenever a non-token creature enters the battlefield, its controller's creates a token that's a
copy of it except is not legendary, it's a 1/1
shadow in addition to its others type.