What it does
"Rot Fly" isn't an official Magic keyword or ability—it's not a recognized term in the game's rules. You may be thinking of a specific creature card, a misremembered name, or a combination of mechanics like "Flying" paired with a creature that has decay or rot-themed abilities.
If you're looking for related concepts: Flying means a creature can only be blocked by creatures with flying or reach. Cards with "rot" themes often involve -1/-1 counters, sacrifice effects, or graveyard synergies common in black and green decks. There's also Infect and Wither, which deal damage as -1/-1 counters and tie thematically to rot and decay.
If you can share the exact card name or where you saw "Rot Fly," I can give you an accurate explanation. Double-check the card on Gatherer or Scryfall to confirm the correct terminology.
Iconic cards with Rot Fly
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