Hall of Gemstone

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.

CMC

Set

WC98

Rarity

rare

Price

$4.50

FORMATS

CommanderLEGAL

Brawl (Historic)NOT LEGAL

StandardNOT LEGAL

ModernNOT LEGAL

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Comments & Rulings · 4

W
Wizards of the Coast2004-10-04 · official ruling
Will not affect lands that do not produce mana.
W
Wizards of the Coast2004-10-04 · official ruling
Although the color may be altered, any restrictions on the use of the mana are not removed.
W
Wizards of the Coast2008-10-01 · official ruling
This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards.
W
Wizards of the Coast2016-08-23 · official ruling
Any colorless mana that's produced isn't affected.