Mire Boa

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.)

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6o50552jappb1hfn4l9ijx.