The woman seems to be casting some kind of ritual, gathering white light and releasing it into the ground every so often.
I don't like that this changes spells from "Counter target instant or sorcery spell" to "counter target permanent or sorcery spell". Otherwise seems interesting and different. 7.5/10
(If he recognizes the type of magic is up to you. It's some kind of starlight magic doing the thing the card does.)
Forgiving Light Enchantment When Forgiving Light enters the battlefield, exile all Spirits and all creature cards from graveyards. If a Spirit would enter the battlefield or a creature would die, instead exile it.