Omnipotence

You may cast spells from your graveyard.
When casting a spell, you may pay life equal to
its mana value rather than pay its mana cost.
Whenever a card would be put into your
graveyard from anywhere, exile it instead.
"In the realm of absolute power, there exists a force
beyond measure: omnipotence. It is the essence of
authority, transcending the bounds of mortal comprehension"
— Ob Nixilis