Form of the Lich

Hexproof.
When Form of the Lich enters the battlefield your life total becomes 12.
Whenever you take damage, discard that many cards.
Whenever you gain life, draw that many cards.
At the beginning of your upkeep put a 1/1 black Skeleton creature token onto the battlefield.
{b}, Sacrifice a creature: Gain X life where X is that creatures converted mana cost.