What it does
I'm not aware of "Rites of Banishment" as an official Magic: The Gathering keyword or ability. It doesn't match any standard keyword (like flying, deathtouch, banding) or named ability mechanic in the game.
It's possible you're thinking of a specific card name, a homebrew/custom card, or perhaps a misremembered term. There are cards with "banish" or "exile" effects, and there's a creature type and various flavor-named abilities, but "Rites of Banishment" isn't among the recognized rules terms.
If you can share the exact card or where you encountered this, I can give you an accurate breakdown of how it works, the common rules pitfalls, and its relevance in Commander. I'd rather not invent mechanics that could mislead your gameplay.
Iconic cards with Rites of Banishment
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