The Winged Dragon of Ra

Flying, Haste, Hexproof
As an additional cost to cast this card, sacrifice
3 creatures you control with total mana value {10} or more.
When this creature enters the battlefield you may
pay {x} life. If you do, this creature enters with
that many +1/+1 counters on it. At the
beginning of your battle phase each turn you
may remove a +1/+1 counter from this card. If
you do, exile target permanent.