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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
Oceanus Dragon 4UUCreature — Dragon Flying When Oceanus Dragon enters the battlefield, tap target creature an opponent controls. Goad it. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.) 3/5
Myr Reservoir 3Artifact {T}: Add {C}{C}. Spend this mana only to cast Myr spells or activate abilities of Myr. {3}, {T}: Return target Myr card from your graveyard to your hand.
Hand to Hand 2REnchantment During combat, players can't cast instant spells or activate abilities that aren't mana abilities.
Vanguard of the Rose 1WCreature — Vampire Knight {1}, Sacrifice another creature or artifact: Vanguard of the Rose gains indestructible until end of turn. Tap it. 3/1
Goblin Game 5RRSorcery Each player hides at least one item, then all players reveal them simultaneously. Each player loses life equal to the number of items they revealed. The player who revealed the fewest items then loses half their life, rounded up. If two or more players are tied for fewest, each loses half their life, rounded up.
Karn's Touch UUInstant Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn. (It retains its abilities.)
Mage's Guile 1UInstant Target creature gains shroud until end of turn. (It can't be the target of spells or abilities.) Cycling {U} ({U}, Discard this card: Draw a card.)
Herald of Torment 1BBEnchantment Creature — Demon Bestow {3}{B}{B} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) Flying At the beginning of your upkeep, you lose 1 life. Enchanted creature gets +3/+3 and has flying. 3/3
Blood Tyrant 4UBRCreature — Vampire Flying, trample At the beginning of your upkeep, each player loses 1 life. Put a +1/+1 counter on Blood Tyrant for each 1 life lost this way. Whenever a player loses the game, put five +1/+1 counters on Blood Tyrant. 5/5
The Avenger Hero {3}, {T}: Target creature you control gains deathtouch until end of turn.
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