Voids Offering

You must pay 10 life or discard seven cards to
cast this spell. This permanent can't be exiled.
Split Second, Hexproof, Indestructible
You can't lose the game and your opponents
can't win the game. Any time you would take
damage, instead mill that many cards. Then exile
all creatures from all graveyards, if ten or more creatures are exiled this way this turn, then remove
this enchantment from the game.