Euphoria, Tomb of Thorns

Defender, Lifelink, Deathtouch, Reach
{t}: Exile the top card of your library with a thorn counter on it
Whenever a creature that Euphoria,
Tomb of Thorns has dealt damage to this turn
dies, exile it with a thorn counter on it
Pay {x} life: Cast a nonland card exiled with a
thorn counter on it with total CMC {x}
without paying its mana cost.