Winged Dragon of Ra

Flying Lifelink Indistructable
As an additional cost to cast Winged Dragon of
Ra, sacrafice 3 creatures.
Winged Dragon of Ra can't be countered.
When Winged Dragon of Ra enters the battlefield, you may pay X life. Winged Dragon
of Ra's power and toughness are equal to the
amount of life paid.
Pay 10 life: Exile target creature.