Yumigami, God of the Moon

Enchant legendary creature
If a source an opponent controls would deal damage
to enchanted creature, prevent 1 of that damage.
Whenever Yumigami or another Celestial Aura enters
the battlefield under your control, conjure a card
named Crescent into your hand.
"You may use the moonlight in conjunction with your
own light on your perilous journey!"