Karn of the Gatewatch

+3: Exile target noncreature, nonplaneswalker permanent, then return target land card from your graveyard to the battlefield tapped.
-3: Noncreature artifacts you control become 3/3 Construct creatures with Ingest until the end of turn.
-12: Exile all permanents target opponent controls, then return those permanents to the battlefield under your control during your next upkeep.