Mire Boa is a common Creature — Snake card from Planar Chaos (PLC), collector number 135. Current market price: $0.17 (foil $1.11), TCGplayer market prices via Scryfall.
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) {G}: 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.)