Kah, missionary of Athena

When a permanent enters, gain life equal to your devotion to white.
At the beginning of your upkeep, if you have more life than your starting life, lose life until your life total is equal to your starting life.
When you gain 5 or more life, put a +1/+1 counter on target creature.
When you gain 10 or more life, draw a card.
When you gain 15 or more life, create a 1/1 white angel creature token but don't activate the first ability of this card.