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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
Shrieking Affliction BEnchantment At the beginning of each opponent's upkeep, if that player has one or fewer cards in hand, they lose 3 life.
Barrin's Spite 2UBSorcery Choose two target creatures controlled by the same player. Their controller chooses and sacrifices one of them. Return the other to its owner's hand.
Sentinel of the Eternal Watch 5WCreature — Giant Soldier Vigilance (Attacking doesn't cause this creature to tap.) At the beginning of combat on each opponent's turn, tap target creature that player controls. 4/6
Painiac 2RCreature — Brainiac At the beginning of your upkeep, roll a six-sided die. Painiac gets +X/+0 until end of turn, where X is the result. 0/3
The Abyss 3BWorld Enchantment At the beginning of each player's upkeep, destroy target nonartifact creature that player controls of their choice. It can't be regenerated.
Mirror Mirror 7Artifact Mirror Mirror enters the battlefield tapped. {7}, {T}, Sacrifice Mirror Mirror: Choose target player. At the beginning of the next end step, exchange life totals with that player, exchange control of all permanents you and that player control, and exchange cards in your hands, cards in your libraries, and cards in your graveyards.
Double Take 3UUInstant Choose another player. You draw two cards. At the beginning of the first upkeep in your next game with that player, you draw two cards.
Troyan, Gutsy Explorer 1GULegendary Creature — Vedalken Scout {T}: Add {G}{U}. Spend this mana only to cast spells with mana value 5 or greater or spells with {X} in their mana costs. {U}, {T}: Draw a card, then discard a card. 1/3
Petra Sphinx 2WWWCreature — Sphinx {T}: Target player chooses a card name, then reveals the top card of their library. If that card has the chosen name, that player puts it into their hand. If it doesn't, the player puts it into their graveyard. 3/4
Curse of Surveillance 4UEnchantment — Aura Curse Enchant player At the beginning of enchanted player's upkeep, any number of target players other than that player each draw cards equal to the number of Curses attached to that player.
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