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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
Angelic Armaments 3Artifact — Equipment Equipped creature gets +2/+2, has flying, and is a white Angel in addition to its other colors and types. Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)
Monkey Monkey Monkey 3GCreature — Monkey As Monkey Monkey Monkey enters the battlefield, choose a letter. Monkey Monkey Monkey gets +1/+1 for each nonland permanent whose name begins with the chosen letter. 1/1
Cursed Land 2BBEnchantment — Aura Enchant land At the beginning of the upkeep of enchanted land's controller, Cursed Land deals 1 damage to that player.
Collective Voyage GSorcery Join forces — Starting with you, each player may pay any amount of mana. Each player searches their library for up to X basic land cards, where X is the total amount of mana paid this way, puts them onto the battlefield tapped, then shuffles.
Dead Ringers 4BSorcery Destroy two target nonblack creatures unless either one is a color the other isn't. They can't be regenerated.
Yule Ooze 2RGCreature — Ooze At the beginning of your upkeep, destroy another nonland permanent chosen at random, then put a number of +1/+1 counters on Yule Ooze equal to that permanent's converted mana cost. {R}{G}, Eat some food: Regenerate Yule Ooze. 1/1
Quicksilver Fountain 3Artifact 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. At the beginning of each end step, if all lands on the battlefield are Islands, remove all flood counters from them.
Happily Ever After 2WEnchantment When Happily Ever After enters the battlefield, each player gains 5 life and draws a card. At the beginning of your upkeep, if there are five colors among permanents you control, there are six or more card types among permanents you control and/or cards in your graveyard, and your life total is greater than or equal to your starting life total, you win the game.
Mana-Charged Dragon 4RRCreature — Dragon Flying, trample Join forces — Whenever Mana-Charged Dragon attacks or blocks, each player starting with you may pay any amount of mana. Mana-Charged Dragon gets +X/+0 until end of turn, where X is the total amount of mana paid this way. 5/5
Gwenna, Eyes of Gaea 2GLegendary Creature — Elf Druid Scout {T}: Add two mana in any combination of colors. Spend this mana only to cast creature spells or activate abilities of a creature or creature card. Whenever you cast a creature spell with power 5 or greater, put a +1/+1 counter on Gwenna, Eyes of Gaea and untap it. 2/3
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