Relathys, Unhallowed Assassin

Skulk, First Strike
Whenever Relathys deals damage to a player, draw a card, then discard two cards.
{t}, Exile any number of cards from your graveyard, Relathys deals X damage to target creature or planeswalker where X is the total converted mana cost of the exiled cards. You lose X life.
Sacrifice a creature: Untap Relathys.