Yharon, Dragon of Rebirth

Flying, Vigilance
If 'Yharon, Dragon of Rebirth' is killed or exiled, it remains in play. It gets 3 -1/-1 tokens. (This effect can only happen once per game)
{x}, {t}: For every three mana spent, add 2 +1/+1 to a target creature that isn't 'Yharon, Dragon of Rebirth' until the end of your turn.