Varian, Lo'Gosh

+3: Creatures you control cannot be destroyed by combat until end of turn.
-7: Until end of turn, Varian becomes a 7/7 Human Warrior creature that's still a planeswalker with hexproof and indestructible.
-15: You gain an emblem with "Whenever you play a creature, you may search your library for any permanent and put it onto the battlefield."