Diodora, The Cunning

+2: Look at the top card of your library, you may exile it if it's an instant or sorcery card. You may cast cards exiled this way.
-10: You gain an emblem with "Whenever you cast a card from exile, creatures you control gain +3/+3, lifelink and first strike until end of turn."
: As long as your devotion to white, blue and red is less than eight, you can't activate any of Diodora's abilities and he can't be attacked.