The Winged Dragon of Ra

Indestructible, Shroud, Flying
This Spell can not be countered.
When the Winged Dragon of Ra is summoned, sacrifice 3 Creatures you control.
Power and Toughness of Ra is equal to the
combined Power and Toughness of the sacrificed creatures. —You can reduce your total life to 1:
Ra gains Power and toughness equal to the
reduced life. If this Ability resolves successfully,
you can not lose until Ra leaves the battlefield.