The Winged Dragon of Ra

Flying, haste, regenerate
As an additional cost to cast The Winged Dragon
of Ra, sacrifice three creatures. When you cast
this card, it cannot be countered or negated.
This card's Power and Toughness are equal to
the combined total of the creatures sacrificed
to cast it.
Pay {x} life: This card gets +{x}/+{x}
Pay {3} life: Destroy a creature you don't control.