Card Codex

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17 May 2024: Card library updated.

Hall of Gemstone

1GG · World Enchantment

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.

Similar cards

Color identity:
NameManaTypeText
Prize Pig 1GCreature — Boar Whenever you gain life, put that many ribbon counters on Prize Pig. Then if there are three or more ribbon counters on Prize Pig, remove those counters and untap it. {T}: Add one mana of any color. 0/3
Outcaster Trailblazer 2GCreature — Human Druid When Outcaster Trailblazer enters the battlefield, add one mana of any color. Whenever another creature with power 4 or greater enters the battlefield under your control, draw a card. Plot {2}{G} (You may pay {2}{G} and exile this card from your hand. Cast it as a sorcery on a later turn without paying its mana cost. Plot only as a sorcery.) 4/2
Sasaya's Essence Legendary Enchantment Whenever a land you control is tapped for mana, add an additional one mana of any type that land produced for each other land you control with the same name as it.
Alter Reality 1UInstant Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.) Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
Black Vise 1Artifact As Black Vise enters the battlefield, choose an opponent. At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.
Oath of Mages 1REnchantment At the beginning of each player's upkeep, that player chooses target player who has more life than they do and is their opponent. The first player may have Oath of Mages deal 1 damage to the second player.
Ghouls' Night Out 3BBSorcery For each player, choose a creature card in that player's graveyard. Put those cards onto the battlefield under your control. They're black Zombies in addition to their other colors and types and they gain decayed. (A creature with decayed can't block. When it attacks, sacrifice it at end of combat.)
Guard Dogs 3WCreature — Dog {2}{W}, {T}: Choose a permanent you control. Prevent all combat damage target creature would deal this turn if it shares a color with that permanent. 2/2
Captivating Cave Land — Cave {T}: Add {C}. {1}, {T}: Add one mana of any color. {4}, {T}, Sacrifice Captivating Cave: Put two +1/+1 counters on target creature. Activate only as a sorcery.
Cave of Temptation Land {T}: Add {C}. {1}, {T}: Add one mana of any color. {4}, {T}, Sacrifice Cave of Temptation: Put two +1/+1 counters on target creature. Activate only as a sorcery.
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