Whir of Invention [Aether Revolt Prerelease Promos] Base Set Unlimited Add an amount of mana

Add an amount of mana of that color equal to your devotion to that color

(They're still affected by summoning sickness

Creature you control with toxic lose toxic and gain infect

{T}: Add one mana of any color

Set: Black & White: Plasma Freeze Type: Dragon Rarity: Ultra Rare Retreat cost: Colorless

Whir of Invention [Aether Revolt Prerelease Promos] Base Set Unlimited Add an amount of manaSet: Aether Revolt Prerelease Promos Type: Instant Rarity: Rare Cost: {X}{U}{U}{U} Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.