Change the Equation [March of the Machine]

Set: March of the Machine Type: Instant Rarity: Uncommon Cost: {1}{U} Choose one —• Counter target spell with mana value 2 or less.• Counter target red or green spell with mana value 6 or less. “It's not your fault. Strixhaven taught you an imperfect premise. Okay, the imperfect execution was your fault.”