Dragonlord Uluthox

Flying, Hexproof, Menace
Whenever Dragonlord Uluthox deals combat
damage to a player, that player reveals their
hand. You choose three cards from it. That player exiles those cards.
{x}{u}{b}: Each opponent reveals cards from the top
of their library until they reveal X land cards,
then puts all cards revealed this way into their
graveyard. X can't be 0.