Oracle Of Infinity

you may pay {0} instead of oracle of infinity's mana cost
whenever you gain life, each opponent loses that much life.
whenever a creature enters the battlefield, exile target creature and return it onto the battlefield.
whenever a creature you control dies, return another creature from your graveyard to the battlefield
if you have no cards in your library while oracle is on the battlefield, in your hand or in your graveyard, you win the game