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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
Krallenhorde Killer Creature — Werewolf {3}{G}: Krallenhorde Killer gets +4/+4 until end of turn. Activate only once each turn. At the beginning of each upkeep, if a player cast two or more spells last turn, transform Krallenhorde Killer. 2/2
Price of Knowledge 6BEnchantment Players have no maximum hand size. At the beginning of each opponent's upkeep, Price of Knowledge deals damage to that player equal to the number of cards in that player's hand.
Roiling Vortex 1REnchantment At the beginning of each player's upkeep, Roiling Vortex deals 1 damage to them. Whenever a player casts a spell, if no mana was spent to cast that spell, Roiling Vortex deals 5 damage to that player. {R}: Your opponents can't gain life this turn.
Near-Death Experience 2WWWEnchantment At the beginning of your upkeep, if you have exactly 1 life, you win the game.
Citadel Siege 2WWEnchantment As Citadel Siege enters the battlefield, choose Khans or Dragons. • Khans — At the beginning of combat on your turn, put two +1/+1 counters on target creature you control. • Dragons — At the beginning of combat on each opponent's turn, tap target creature that player controls.
Thieves' Auction 4RRRSorcery Exile all nontoken permanents. Starting with you, each player chooses one of the exiled cards and puts it onto the battlefield tapped under their control. Repeat this process until all cards exiled this way have been chosen.
Call to the Grave 4BEnchantment At the beginning of each player's upkeep, that player sacrifices a non-Zombie creature. At the beginning of the end step, if no creatures are on the battlefield, sacrifice Call to the Grave.
Dreams of Steel and Oil BSorcery Target opponent reveals their hand. You choose an artifact or creature card from it, then choose an artifact or creature card from their graveyard. Exile the chosen cards.
Coalition Honor Guard 3WCreature — Human Flagbearer While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able. 2/4
Standard Bearer 1WCreature — Human Flagbearer While an opponent is choosing targets as part of casting a spell they control or activating an ability they control, that player must choose at least one Flagbearer on the battlefield if able. 1/1
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