Buy @ TCGplayer
If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type.
This does not change the amount of mana gained. It just makes all the mana generated by the basic land be of a single color of your choice.
You can choose a different color each time a basic land is tapped.
You can choose the same color or mana the land would normally produce.
