Goblins is a fast aggro deck that wins through Goblin Lackey putting threats into play for free and Goblin Piledriver becoming enormous in combat. Your engine of Priest of Titania, Wirewood Symbiote, and Gaea's Cradle can outpace them in resources if you survive the early game, and Wellwisher is a key card that can single-handedly stabilize if you can untap with it. Goblin Sharpshooter comes in as a board wipe against their x/1 creatures — it combos with Wirewood Symbiote to repeatedly untap and machine-gun their board. Tribal Forcemage is the only cut since it requires a large board state to be useful and the mana is better spent establishing your engine.