What it does
"The Allagan Eye" isn't an official Magic: The Gathering keyword or ability—it doesn't appear on any real MTG card or in the comprehensive rules. It sounds like it's borrowed from Final Fantasy XIV, where the Allagan Empire and its eye-based imagery are lore staples.
With the Final Fantasy Universes Beyond set having released, it's possible you encountered this on a custom, proxy, or fan-made card, or mixed up the name of a real mechanic. If you saw it in a deck, check the actual card text: the rules-relevant keywords will be defined in the reminder text or rulings.
If you can share the exact card name or wording, I can break down how it actually functions and flag any Commander-specific interactions or common misplays. As written, though, there's nothing official to explain.
Iconic cards with The Allagan Eye
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