Uraska, King of the Deeps

+3: Until end of turn, each land you control becomes a 2/2 blue Horde creature token with undying. It's still a land
-4: You get an emblem with, Islands you control have "Whenever this is tapped for mana, each player discards a card.
-10: Destroy each nonland creature, then draw a card for each creature destroyed this way.