Relic of Cursed Knowledge

As Relic of Cursed Knowledge enters the battlefield, you may sacrifice a creature. Relic of Cursed Knowledge enters the battlefiled with a number of curse counters on it equal to the converted mana cost of the sacrificed creature.
{2}, {t}, Remove a curse counter form Relic of Cursed Knowledge: Draw a card.
"Greatness...... at a big cost."
-Dethkil, Threatening Lich