Goblins is a fast aggro deck that wins by flooding the board with lords and synergy creatures before you can establish your engine, so your priority is surviving long enough to lock them out with Solitary Confinement or Parallax Wave. Seal of Cleansing and the additional Aura of Silence handle their Naturalize and any stray artifacts like Goblin Tinkerer's targets, while the extra Swords to Plowshares buys time against early Goblin Lackey threats. Parallax Wave is your most important card — it can exile their entire board for a turn cycle, and combined with Solitary Confinement you become virtually unassailable. Replenish is trimmed since this matchup is about establishing a lock quickly rather than recovering from a graveyard setup, and one Mirri's Guile comes out to make room without disrupting the draw engine. Watch out for Rishadan Port disrupting Serra's Sanctum on your combo turn, so try to have a Brushland or Forest available as backup mana.