Winged Dragon of Ra

Flying, Hexproof, Trample, Haste, Protection
from Instants and Sorceries
Winged Dragon of Ra is a colorless creature
When Winged Dragon of Ra attacks you sacrifice
any number of creatures to increase its power and
toughness equal to the sacrificed creatures.
{p/c}{p/c}{p/c}{p/c}Destroy Target Creature.
{x}{p/c}Increase Winged Dragon of Ra's power and toughness equal to X.