Heir of the Ancient Fang is a common Creature — Snake Samurai card from Kamigawa: Neon Dynasty (NEO), collector number 191. Current market price: $0.06 (foil $0.14), TCGplayer market prices via Scryfall.
This creature enters with a +1/+1 counter on it if you control a modified creature. (Equipment, Auras you control, and counters are modifications.)