Yorth, Fear of Humanity

Menace, Deathtouch
Whenever Yorth, Fear of humanity attacks,
defending player discards a card from his or her
hand at random. Yorth gets +X/+X until the end
of turn where X its that card's converted mana cost.
Whenever an opponent discards a card from
Yorth's ability, if it's a land card put it onto the battlefield under your control. Otherwise, exile it,
you may cast cards exiled this way.