What it does
I'm not aware of "Skyswarm" as an official Magic: The Gathering keyword or ability. It doesn't correspond to any printed evergreen, deciduous, or set-specific mechanic that I can verify.
It's possible you're thinking of a card name, a fan-made or custom mechanic, or a similar-sounding keyword like Skulk, Flying, Swarm mechanics from specific sets, or the creature-type/tribal "flyers matter" themes. If you saw this on Mythicwyrm specifically, it may be a custom or homebrew keyword unique to that platform, and I'd need its actual reminder text to explain it accurately.
If you can share the card or the rules text printed alongside "Skyswarm," I'll gladly break down what it does, the common rules pitfalls, and how it plays out in Commander. I don't want to invent mechanics and mislead you.
Iconic cards with Skyswarm
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