Mage of Bolas

Deathtouch, Indestructible, Prowess
{u}{u}{p/b} Counter target spell and exile it. Deal 5 damage to both players unless they sacrifice a creature.
{3}{b}{b}{b}{t} Exile all lands your opponents controls. If you control a Nicol Bolas planeswalker, inflict 2 damage for each card exiled this way.