Akumatheon, Shadowcaller

Whenever an effect would have you draw a card, you instead exile that card.
You may play cards from exile.
Akumatheon, Shadowcaller's power is equal to how many cards are in exile.
{t}{2}{b}: Exile the top card of your library. If it's a creature card, put it into play with a +1/+1 counter on it, it gains shadow.