Mix, Chaos Incarnate

Mix, Chaos Incarnate costs {x} less to cast, where
X is the number of cards played from exile this
turn.
{w}{u}{b}{r}{g},{t}: Until the beginning of your next
untap step, you may play cards from exile.
(Timing rules still apply.)
Whenever you play a card from exile, put a
+1/+1 counter on Mix, Chaos Incarnate.