Hall of Gemstone
World Enchantment (CMC 3)
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.
Decks with Hall of Gemstone
[MIR] Mirage #221 (R)
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[WC98] World Championship Decks 1998 #bs221sb (R)