Gandalf the White

+2: Draw a card, then you may cast a spell with converted mana cost equal to the number of cards in your hand.
0: Tap up to three target permanents, or untap up to three creatures. Those creatures get +1/+1 and gain indestructible until your next turn.
-12: Each opponent plays with their hands revealed, you may exile up to one card from each opponent's hand. You may cast cards exiled this way.