Mire Boa is a uncommon Creature — Snake card from Time Spiral Remastered (TSR), collector number 219. Current market price: $0.26 (foil $0.49), 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.)