Domain Zoo is extremely fast and aggressive, so Abrupt Decay is excellent removal for Ragavan, Nimble Pilferer, Wild Nacatl, or Territorial Kavu before mana value 3, all uncounterable against their Stubborn Denial and Spell Pierce. Vexing Bauble helps tax their free spell, Mutagenic Growth-style interaction is absent here but Vexing Bauble still counters any truly free spells and can later cantrip when no longer needed. Cut slower value pieces like Agatha's Soul Cauldron and Formidable Speaker that don't impact the race quickly enough against a deck built to kill by turn 4-5. This matchup is about stabilizing the board and using our bigger creatures to out-block and out-race their aggressive curve.