Nykthos Ramp wants to resolve huge threats like Cavalier of Thorns and Storm the Festival, so Change the Equation is live against their green spells with mana value 6 or less, hitting Storm the Festival and Cavalier of Thorns outright. Redcap Melee's 4 damage and Abrade's 3 damage handle their mana dorks and midsize threats like Old-Growth Troll. Stubborn Denial is weaker here since it only taxes 1 extra mana against a ramp deck that floods mana easily, even with ferocious online; trim to two copies is unnecessary, but cutting Fading Hope and Winternight Stories for more removal against their bigger bodies is the priority since bounce and card-advantage-sorceries are too slow.