Hexgold Slith is a common Creature — Slith card from Modern Horizons 3 (MH3), collector number 30. Current market price: $0.11 (foil $0.12), TCGplayer market prices via Scryfall.
When this creature enters, you get {E}{E} (two energy counters). Whenever this creature attacks, you may pay {E}{E}. If you do, it gains first strike until end of turn. Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.