What it does
"Parallel Universe" isn't a real Magic keyword or ability—it doesn't appear on any card or in the comprehensive rules. You may be thinking of a few similarly-themed things: there's the old vintage card Parallel Thoughts, the planeswalker mechanics around alternate timelines in sets like Modern Horizons, or simply the flavor concept of alternate realities that shows up in Multiverse lore.
If you meant a specific mechanic, the closest real keyword might be something like Clone effects (copying permanents) or cards that exile and recast from alternate zones. Double-check the exact card name or oracle text, since EDH rulings hinge on precise wording.
If you can share the card you saw this on, I'll explain exactly what it does, the common rules misunderstanding, and where it shines in Commander.
Iconic cards with Parallel Universe
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