Princess Celestia

+2: Until your next turn, prevent all damage that would be dealt by noncreature spells or abilities your opponent controls.
-4: Until your next turn, Princess Celestia becomes a 5/5 with Haste, Vigilance, Hexproof, Flying, and Indestructable. It's still a planeswalker.
-10: You gain an emblem: "At the beginning of your upkeep, draw 5 cards, gain 5 life, and place 5 permanents from your hand onto the battlefield."