Aeron Vaal, Supreme Augur

+2: Look at the top card of your library. You may put it into your hand. If you do, put the top card of your library into your graveyard.
-3: The next time you cast an instant or sorcery spell this turn, return it to its owner's hand as it resolves.
-10: Exile all creatures, then create an 8/8 blue Dragon creature token with flying.