What it does
"Gathered Swarm" isn't a standard MTG keyword—it's not an evergreen or named ability word that appears on cards. You may be thinking of a few similar things: the "Swarm" mechanic, "Gathering" effects, or a specific card or token name.
If you mean swarm-style strategies generally: these decks flood the board with many small creatures (tokens or cheap bodies) and win through go-wide effects, anthem buffs, or sacrifice synergies. The common rules nuance is that token-makers and "creatures you control" triggers care about quantity, so board wipes hurt disproportionately.
Could you double-check the exact card name or wording? If "Gathered Swarm" is reminder text from a specific card (like a Saga chapter or an Adventure), tell me the card and I'll explain precisely how it functions and when it matters in Commander.
Iconic cards with Gathered Swarm
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