Tzeentch, Lord of Change

Delve, Flying, Ward—{3}, Pay 3 life, Mill three
If a card would be put into a graveyard, exile it
instead.
Whenever you cast a noncreature spell, Tzeentch connives.
You may cast one spell from exile each turn and
you may spend mana as though it were mana of
any color to cast cards your opponents own from
exile.