Blood Moon is excellent here since their manabase leans on nonbasic lands (Verdant Catacombs, Windswept Heath, Overgrown Tomb, Boseiju, dual lands) while Devoted Druid and Delighted Halfling can still function as mana dorks regardless, but it slows their fetches and Leyline of Abundance-fueled explosive turns significantly. Meltdown answers Agatha's Soul Cauldron, a key combo piece that turns +1/+1 counters into a lethal activated ability engine. Force of Negation is a reasonable card against their combo but we already have Counterspell and Subtlety as interaction, so we trim one copy along with a Spell Pierce that taxes rather than stops their dorks.