Tachigami, God of Rending

Enchant legendary creature
If a source an opponent controls would deal damage
to enchanted creature, prevent 1 of that damage.
Whenever Tachigami or another Celestial Aura enters
the battlefield under your control, conjure a card
named Power Slash into your hand.
"Make good use of this sword in your endeavors, as
it was designed to conquer evil."