Mono Red Rally goldfishes extremely fast using Burning-Tree Emissary and Rally at the Hornburg to flood the board and swing for lethal, so Blue Elemental Blast and Hydroblast are premium answers that can counter Rally at the Hornburg itself or destroy key red permanents like Clockwork Percussionist before they generate value. Cut Abandon Attachments, Spell Pierce, and Plunder the Trollshaws since this matchup demands immediate answers over card selection or a tax effect that's irrelevant against a deck full of free or one-mana spells. Prioritize holding up Counterspell and Snuff Out for their key haste threats.