Hall of Gemstone is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card 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.
How it works : Hall of Gemstone
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Any colorless mana that's produced isn't affected.
No other card is named in this ruling.
- #2· Wizards of the Coast
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.
No other card is named in this ruling.
- #3· Wizards of the Coast
Although the color may be altered, any restrictions on the use of the mana are not removed.
No other card is named in this ruling.
- #4· Wizards of the Coast
Will not affect lands that do not produce mana.
No other card is named in this ruling.
Legal formats
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Meta decks with Hall of Gemstone
No archived Top 8 deck with this card yet.