What it does
I don't have reliable information about a Magic: The Gathering keyword or ability called "Mutsunokami." This doesn't correspond to any official MTG keyword, ability word, or mechanic that I'm aware of.
It's possible this is a misspelling, a card name rather than an ability, a term from a different game, or something fan-made. For reference, real Japanese-flavored mechanics from sets like Kamigawa: Neon Dynasty include things like Channel, Ninjutsu, Reconfigure, and Saga enchantments.
If you can share the exact card text or where you encountered "Mutsunokami," I'd be happy to help explain how it actually works in Commander. I'd rather tell you I'm not sure than invent rules that could lead you astray during a game.
Iconic cards with Mutsunokami
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