The Flamethrower appears as a Weapon Card in the Deck Building Game's "Alliance" expansion.
Much like the Longbow from the first set, the Flamethrower has its own unique deck in the Resource Area. Its ammo requirement is listed as 0 while its Damage is listed as "X". This is due to its effect. "X" in this case = 5 times the number of cards in a players discard pile. Due to this effect the flamethrower has been banned in some unofficial play. Billy Coen has this card in his inventory if the "custom loadouts" listed in the game's manual are used. It fits, as one one of Billy's effects has him taking cards out of his discard pile, which can effect the amount of damage he deals with this weapon. It has a Gold Cost of 90.