Open the Omenpaths is a common Instant card from Kaldheim (KHM), collector number 143. Current market price: $0.15 (foil $0.33), TCGplayer market prices via Scryfall.
Choose one — • Add two mana of any one color and two mana of any other color. Spend this mana only to cast creature or enchantment spells. • Creatures you control get +1/+0 until end of turn.