The Winged Dragon of Ra

Flying, Vigilance, Trample, Immunity
(You must sacrifice 3 creatures in addition to the casting cost)
* is equal to the Power of the creatures sacrificed.
Pay 10: Exile 1 creature and deal 5 to that player.
Pay all but 1 Life, add paid life to
Power/Toughness
Reduce Power/Toughness to 1/1 and add the
reduced amount to your Life.