What it does
"Endless Swarm" isn't an official Magic: The Gathering keyword or ability, so there's nothing standardized to explain. It may be a custom or homebrew mechanic specific to a particular playgroup, a fan-made card, or a misremembered name for something else.
If you're thinking of a real mechanic, you might mean Encore (pay a cost to exile a creature from your graveyard and create token copies that attack, then get sacrificed), Amass (grow a single Army token), or Populate (copy a token you control). Each has very different rules and timing implications in Commander.
If "Endless Swarm" comes from a specific custom card or set, share the exact card text and I'll break down what it does, the rules traps to watch for, and how it plays out in multiplayer EDH.
Iconic cards with Endless Swarm
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