Goblin Goblins is a fast aggressive deck with no enchantment or artifact removal of its own beyond sideboarded Naturalize, so our existing Swords to Plowshares and Abeyance already provide solid tools: Swords exiles their biggest threat like Siege-Gang Commander, and Abeyance can stop a key activated ability like Goblin Sharpshooter's damage ping or Siege-Gang's sacrifice outlet for a turn. Karmic Justice punishes them if they bring in Naturalize against one of our enchantments, letting us destroy a problematic permanent of theirs in return. Gaea's Blessing helps rebuy key cards if they manage to strip our graveyard resources or if we need to shuffle back Swords to Plowshares after use. We trim Opalescence and Replenish since neither is as urgently needed against a deck with few enchantments to animate or reanimate against.