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Hall of Gemstone

Mirage — rare

World Enchantment

Hall of Gemstone rulings:

2016-08-23: Colorless mana added to a player’s mana pool isn’t affected.

2008-10-01: This has the supertype world. When a world permanent enters the battlefield, 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 the battlefield at the same time, they’re both put into their owners’ graveyards.

2004-10-04: Although the color may be altered, any restrictions on the use of the mana are not removed.

2004-10-04: Will not affect lands that do not produce mana.

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6.21/10

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Karona, False God

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Magnetic Mountain

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At the beginning of each player's upkeep, that player may choose any number of tapped blue creatures they control and pay for each creature chosen this way. If the player does, untap those creatures.

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Mudslide

Enchantment

Creatures without flying don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player may choose any number of tapped creatures without flying they control and pay for each creature chosen this way. If the player does, untap those creatures.

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Dimensional Breach

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Oath of Druids

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At the beginning of each player's upkeep, that player chooses target player who controls more creatures than they do and is their opponent. The first player may reveal cards from the top of their library until they reveal a creature card. If the first player does, that player puts that card onto the battlefield and all other cards revealed this way into their graveyard.

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Oath of Lieges

Enchantment

At the beginning of each player's upkeep, that player chooses target player who controls more lands than they do and is their opponent. The first player may search their library for a basic land card, put that card onto the battlefield, then shuffle.

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Power Surge

Enchantment

At the beginning of each player's upkeep, Power Surge deals X damage to that player, where X is the number of untapped lands they controlled at the beginning of this turn.

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Cold Snap

Enchantment

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
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Collapsing Borders

Enchantment

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Free-for-All

Enchantment

When Free-for-All enters the battlefield, exile all creatures face down.
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Greener Pastures

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Mana Vortex

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When you cast this spell, counter it unless you sacrifice a land.
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Mist of Stagnation

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Permanents don't untap during their controllers' untap steps.
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Oath of Ghouls

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Quicksilver Fountain

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At the beginning of each player's upkeep, that player puts a flood counter on target non-Island land they control of their choice. That land is an Island for as long as it has a flood counter on it.
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Rivalry

Enchantment

At the beginning of each player's upkeep, if that player controls more lands than each other player, Rivalry deals 2 damage to them.

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Hall of Gemstone

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