Kassadin, Void Walker

+2: Look at the top 3 cards of your library. You may put a instant or sorcery card from among them into your hand. Put the rest into your graveyard.
-2: Return target creature to its owners hand.
-7: You get an emblem with "Whenever you cast a instant or sorcery, if it would be put into your graveyard. Instead, shuffle it into your library."