Ythris, Master of Aether

: Ythris, Master of Aether is blue, black and red. As long as you control four or more Aetherborn, you may cast any card in exile.
+1: Create a 2/2 black Aetherborn token with haste. Exile it at the beginning of your next upkeep.
-7: Exile up to three nonland permanents. Until your next turn, whenever an opponent taps land for mana, that land deals 1 damage to them.