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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
Lavinia, Azorius Renegade WULegendary Creature — Human Soldier Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls. Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell. 2/2
Fight or Flight 3WEnchantment At the beginning of combat on each opponent's turn, separate all creatures that player controls into two piles. Only creatures in the pile of their choice can attack this turn.
Forgotten Harvest 1GEnchantment At the beginning of your upkeep, you may exile a land card from your graveyard. If you do, put a +1/+1 counter on target creature.
Carnivorous Death-Parrot 1UCreature — Bird Flying At the beginning of your upkeep, sacrifice Carnivorous Death-Parrot unless you say its flavor text. 2/2
Predatory Sludge 2BCreature — Ooze Menace As Predatory Sludge enters the battlefield, choose a permanent you don't control. When the chosen permanent is put into a graveyard from the battlefield, conjure a card named Predatory Sludge into your hand. 3/3
Umbilicus 4Artifact At the beginning of each player's upkeep, that player may pay 2 life. If they don't, they return a permanent they control to its owner's hand.
Takklemaggot 2BBEnchantment — Aura Enchant creature At the beginning of the upkeep of enchanted creature's controller, put a -0/-1 counter on that creature. When enchanted creature dies, that creature's controller chooses a creature that Takklemaggot could enchant. If the player does, return Takklemaggot to the battlefield under your control attached to that creature. If they don't, return Takklemaggot to the battlefield under your control as a non-Aura enchantment. It loses "enchant creature" and gains "At the beginning of that player's upkeep, Takklemaggot deals 1 damage to that player."
Herald's Horn 3Artifact As Herald's Horn enters the battlefield, choose a creature type. Creature spells you cast of the chosen type cost {1} less to cast. At the beginning of your upkeep, look at the top card of your library. If it's a creature card of the chosen type, you may reveal it and put it into your hand.
Fevered Visions 1UREnchantment At the beginning of each player's end step, that player draws a card. If the player is your opponent and has four or more cards in hand, Fevered Visions deals 2 damage to that player.
Horn of Greed 3Artifact Whenever a player plays a land, that player draws a card.
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