The Wicked Avatar

+5: The Wicked Avatar becomes a Legendary Creature-God with power and toughness equal to the highest power on the field+1, not counting itself.
0: This card's abilities only last until the end of the turn they were activated. This ability is not considered activated and cannot be negated.
-20: Place one Winged Dragon of Ra or one Hamon, Lord of Striking Thunder on the battlefield. Return this card to your hand at the end of your turn.