Carpet of Flowers 240 (Urza's Saga)

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.

NM - $8.80
LP - $7.10
MP - $5.30
HP - $3.60
DMG - $1.80