Skaaberen's Craft

Whenever you cast a spell, each player puts the top card of his or her library into his or her graveyard.
{2}{u}{u}: Exile up to two target creature cards from graveyards. Create an X/X blue Zombie Horror creature token, where X is the combined power of creatures exiled this way. Activate this ability only once each turn and any time you could cast a sorcery.