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
Slaughter Pact 0Instant Destroy target nonblack creature. At the beginning of your next upkeep, pay {2}{B}. If you don't, you lose the game.
Nantuko Shaman 2GCreature — Insect Shaman When Nantuko Shaman enters the battlefield, if you control no tapped lands, draw a card. Suspend 1—{2}{G}{G} (Rather than cast this card from your hand, you may pay {2}{G}{G} and exile it with a time counter on it. At the beginning of your upkeep, remove a time counter. When the last is removed, you may cast it without paying its mana cost. It has haste.) 3/2
Blinding Souleater 3Artifact Creature — Phyrexian Cleric {W/P}, {T}: Tap target creature. ({W/P} can be paid with either {W} or 2 life.) 1/3
Kindred Charge 4RRSorcery Choose a creature type. For each creature you control of the chosen type, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step.
Festival WInstant Cast this spell only during an opponent's upkeep. Creatures can't attack this turn.
Denied! UInstant Choose a card name, then target spell's controller reveals their hand. If a card with the chosen name is revealed this way, counter that spell.
Wake of Destruction 3RRRSorcery Destroy target land and all other lands with the same name as that land.
Thassa, God of the Sea 2ULegendary Enchantment Creature — God Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. (Each {U} in the mana costs of permanents you control counts toward your devotion to blue.) At the beginning of your upkeep, scry 1. {1}{U}: Target creature you control can't be blocked this turn. 5/5
Mana Clash RSorcery You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players' coins come up heads on the same flip.
Unblinking Observer 1UCreature — Homunculus {T}: Add {U}. Spend this mana only to pay a disturb cost or cast an instant or sorcery spell. 2/1
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