| Set | Date | Rarity | Treatment |
|---|---|---|---|
| WC98 #bs221sb | 1998-08-12 | Rare | Standard |
| MIR #221 | 1996-10-08 | Rare | Standard |
At the beginning of each player's upkeep, that player chooses a color. Until end of turn, lands tapped for mana produce mana of the chosen color instead of any other color.