Thanos, Plane Destroyer

+2: Look at the top three cards of your library. Put them back in any order, either on the top or the bottom.
-4: Look at the bottom five cards of your library. You may chose an artifact or creature card. Place it into your hand. Put the rest back.
-20: Use this ability only if the Infinity Gauntlet is attached to Thanos, Plane Destroyer. Exile half the permanent cards on the battle field.