Utopia Sprawl is a common Enchantment — Aura card from Dissension (DIS), collector number 99. Current market price: $1.74 (foil $16.97), TCGplayer market prices via Scryfall.
Enchant Forest As this Aura enters, choose a color. Whenever enchanted Forest is tapped for mana, its controller adds an additional one mana of the chosen color.