Egg of the Perfect World

{t}, Pay 2 life: Add two mana in any combination
of colors.
{t}, Sacrifice Egg of the New World and any
number of creatures: cast a card you own from
exile with converted mana value of X where X is
equal to the number of cards sacrificed this way.
"It grants both power and a path to rebirth, but at a
cost to great to fathom."