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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
Might of Murasa 1GInstant Kicker {2}{G} (You may pay an additional {2}{G} as you cast this spell.) Target creature gets +3/+3 until end of turn. If this spell was kicked, that creature gets +5/+5 until end of turn instead.
Flowstone Slide X2RRSorcery All creatures get +X/-X until end of turn.
Rollick of Abandon 3RRSorcery All creatures get +2/-2 until end of turn.
Sphere of Annihilation XBArtifact Sphere of Annihilation enters the battlefield with X void counters on it. At the beginning of your upkeep, exile Sphere of Annihilation, all creatures and planeswalkers with mana value less than or equal to the number of void counters on it, and all creature and planeswalker cards in graveyards with mana value less than or equal to the number of void counters on it.
Blessing of Leeches 2BEnchantment — Aura Flash Enchant creature At the beginning of your upkeep, you lose 1 life. {0}: Regenerate enchanted creature.
Splitting Headache 3BSorcery Choose one — • Target player discards two cards. • Target player reveals their hand. You choose a card from it. That player discards that card.
Xathrid Demon 3BBBCreature — Demon Flying, trample At the beginning of your upkeep, sacrifice a creature other than Xathrid Demon, then each opponent loses life equal to the sacrificed creature's power. If you can't sacrifice a creature, tap Xathrid Demon and you lose 7 life. 7/7
Death Spark RInstant Death Spark deals 1 damage to any target. At the beginning of your upkeep, if Death Spark is in your graveyard with a creature card directly above it, you may pay {1}. If you do, return Death Spark to your hand.
Hydroform GUInstant Target land becomes a 3/3 Elemental creature with flying until end of turn. It's still a land.
Metal Fatigue 2WInstant Tap all artifacts.
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