Jace, Mind Reader

+2: Look at target opponent's hand, then note a card name. Until your next turn, if they cast a spell with that name, counter it and you draw a card.
-2: The owner of target nonartifact creature puts it on top of their library, then mills cards equal to it's toughness.
-6: Choose target opponent. You and that player each mill cards equal to the number of cards in the other player's hand times four.