Knight of the Holy Nimbus is a uncommon Creature — Human Rebel Knight card from The List (PLST), collector number TSP-26. Current market price: $0.21, TCGplayer market prices via Scryfall.
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) If this creature would be destroyed, regenerate it. (Tap it, remove it from combat, and heal all damage on it.) {2}: This creature can't be regenerated this turn. Only your opponents may activate this ability.