The Winged Dragon of Ra

Flying, shroud, haste
Devour 3
Pay X life: Put X +1/+1 counters on The Winged Dragon of Ra.
Remove X +1/+1 counters from The Winged
Dragon of Ra: Gain X life.
If The Winged Dragon of Ra enters the
battlefield from a graveyard, sacrifice The
Winged Dragon of Ra at end of turn.