What it does
I'm not familiar with "Hagneia" as a Magic: The Gathering keyword or ability. It doesn't correspond to any official keyword, ability word, or mechanic that I can verify from the game's rules or card sets.
It's possible this is a misspelling, a fan-made or custom card mechanic, or something from an unofficial source. A few things it might be confused with: "Haste," "Hexproof," or perhaps a creature type or proper noun from flavor text rather than a rules term.
If you can share the exact card or where you encountered "Hagneia," I'd be happy to help clarify what it actually does. I'd rather tell you I don't know than invent rules that could mislead you during a game—incorrect rulings can really matter in Commander.
Iconic cards with Hagneia
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