Utopia Sprawl is a rare Enchantment — Aura card from Secret Lair Drop (SLD), collector number 409. Current market price: $14.61 (foil $14.82), 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.