Crimson Muckwader is a uncommon Creature — Lizard card from The List (PLST), collector number M13-127. Current market price: $0.09, TCGplayer market prices via Scryfall.
This creature gets +1/+1 as long as you control a Swamp. {2}{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)