Magic: The Gathering

Hall of Gemstone

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Hall of Gemstone
Hall of Gemstone MI
Mirage Rare 
Cost: Mana 1Mana GMana G
CMC: 3
Card Type: World Enchantment
Oracle Text: 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.

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