name=Hall of Gemstone
image=https://magiccards.info/scans/en/mr/119.jpg
value=4.010
rarity=R
type=World,Enchantment
cost={1}{G}{G}
ability=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.
timing=enchantment
oracle=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.
status=not supported: when-tap-for-mana
