Morrowgax, Abhorrent Broker

{x}{x}{u}{r}: Reveal the top 3 times X cards of your library. Target opponent chooses a nonland card
from among them and casts that spell without
paying its mana cost. Morrowgax can't be the
target of that spell. Put the other cards into your graveyard.
Whenever an opponent casts a spell without
paying its mana cost, you may put a creature card
from a graveyard onto the battlefield under your control.