Valafar, Forgotten Relic

When Valafar, Forgotten Relic enters the battlefield, it gets six curse counters. Whenever it is untapped, remove a curse counter from him. When Valafar has none, sacrifice him.
Shroud, indestructible.
{t}: You lose 3 life.
{b}, {ut}: Draw 3 cards, discard 3 cards.
{b}, {ut}: Valafar does 3 damage to any target.
{b}, {ut}: Valafar does 6 damage to target planeswalker.