Winged Dragon of Ra

This spell can't be countered
Flying, hexproof
Winged Dragon of Ra enters the battlefield with a number of +1/+1 counters on it equal to the
amount of mana spent to cast it.
Pay 2 life: Destroy targer nonland permanent.
As Winged Dragon of Ra enters the battlefield
from a graveyard, you may pay any amount of life.
It enters the battlefield with that many +1/+1
counters and it gains haste. Sacrifice it at the beggining of the end step.