Undercity Troll is a uncommon Creature — Troll card from Magic Origins (ORI), collector number 202. Current market price: $0.05 (foil $0.33), TCGplayer market prices via Scryfall.
Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.) {2}{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.)