Carpet of Flowers is a rare Enchantment card from Final Fantasy: Through the Ages (FCA), collector number 44. Current market price: $2.30 (foil $22.34), TCGplayer market prices via Scryfall.
At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls.