Tzeentch, Lord of Change

Delve, Flying
Ward—{3}, Pay 3 life, Mill three
If a card would be put into a graveyard and you
didn't cast it, exile it instead.
Whenever you cast a noncreature spell, Tzeentch connives.
You may cast one spell you or an opponent owns
from exile each turn and you may spend mana as
though it were mana of any color to cast it.