This is a fast aggro mirror where the game often comes down to who lands the first unanswered threat and who can out-damage the other before the board stabilizes. Goblin Piledriver and Goblin Warchief are your best cards — protect them and prioritize getting them into play early. Pyrokinesis comes in as free removal to blow out their Ball Lightning or clear multiple small blockers like Mogg Fanatic and Goblin Cadets without spending mana. Goblin Tinkerer and Skirk Prospector are cut as the lowest-impact cards in this matchup — you don't need the artifact disruption and you won't be sacrificing for mana here. Use Mogg Fanatic aggressively to trade with their Grim Lavamancer before it takes over the game.