Hall of Gemstone [Mirage] Vraska Spend this mana only to

Spend this mana only to cast artifact spells

If the player does

Set: Aether Revolt Prerelease Promos Type: Sorcery Rarity: Mythic Cost: {X}{R}{R}{R} Destroy X target artifacts and/or creatures

"Organization is often undervalued but rarely unjustified

Set: Zendikar Type: Creature — Snake Rarity: Mythic Cost: {1}{G} Landfall — Whenever a land enters the battlefield under your control

Hall of Gemstone [Mirage] Vraska Spend this mana only toSet: 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.