Galeem, Lord of Light

Flying, Double Strike
When Galeem enters the battlefield, put X +1/+1 counters on Galeem, where X is your devotion to white,
then put X - 1/-1 counters on all black creatures, where X is your devotion to white
if Galeem has 12 power and toughness or more, if Galeem should be destroyed or exiled, transform instead