Hall of Gemstone [Mirage] SM42 this card's ATK is halved

this card's ATK is halved during damage calculation

and equip it to this card

during damage calculation: This card gains ATK equal to the current ATK of the opponent's monster it is battling during that damage calculation only

Set: Rise of the Duelist Card type: Effect Monster Rarity: Starlight Rare Attack: 100 Defense: 100 (Quick Effect): You can discard this card to the GY

Hall of Gemstone [Mirage] SM42 this card's ATK is halvedSet: Mirage Type: World Enchantment Rarity: Rare Cost: {1}{G}{G} 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.