Muse of Bliss

{w}, Reveal Muse of Bliss from your hand:
Exile it.
As long as Muse of Bliss is exiled, all creatures have "Whenever this creature deals combat damage to a player, you gain 1 life and put a Bliss counter on Muse of Bliss."
Remove 20 Bliss counters from Muse of Bliss:
Put it onto the battlefield. Exile all other creatures.