Alpheonus, Infinity God

Indestructible, Hexproof, Flying, Lifelink, Deathtouch
You may exert this card as it attacks. if you do, destroy each of your opponents creatures.
Whenever there is 10 or more creatures in your opponents graveyard, you may pay {10}. If you do, you gain 100 life, and bring every creature from every graveyard onto the battlefield under your control.