What it does
"Guardian Protocols" isn't an official Magic: The Gathering keyword or ability, so I can't give you accurate rules text for it. It may be a custom card, a fan-made mechanic, a misremembered name, or something from a specific set I'm not recognizing.
If you encountered this on a card, double-check the exact wording printed in the reminder text or oracle text—that's what actually governs how it works. You might be thinking of similar protective abilities like Ward (forces opponents to pay a cost to target your permanent), Hexproof, Shroud, or Protection, which are real keywords with well-defined Commander interactions.
If you can share the full card text or where you saw "Guardian Protocols," I'm happy to break down exactly what it does, the common rules pitfalls, and how it plays out in a multiplayer Commander game.
Iconic cards with Guardian Protocols
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