Carpet of Flowers is a rare Enchantment card from Doctor Who (WHO), collector number 229. Current market price: $1.75 (foil $4.48), 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.