Cindering Cutthroat is a common Creature — Lizard Assassin card from Bloomburrow (BLB), collector number 208. Current market price: $0.11 (foil $0.25), TCGplayer market prices via Scryfall.
This creature enters with a +1/+1 counter on it if an opponent lost life this turn. {1}{B/R}: This creature gains menace until end of turn. (It can't be blocked except by two or more creatures.)