Vial Smasher, Gleeful Grenadier is a uncommon Legendary Creature — Goblin Mercenary card from Outlaws of Thunder Junction (OTJ), collector number 235. Current market price: $0.19 (foil $0.36), TCGplayer market prices via Scryfall.
Whenever another outlaw you control enters, Vial Smasher deals 1 damage to target opponent. (Assassins, Mercenaries, Pirates, Rogues, and Warlocks are outlaws.)