Whir of Invention [Aether Revolt Prerelease Promos] Elemental Let the weak react to

Let the weak react to me

the Hour of Promise

put that card into your graveyard

the Stronghold serves as the gathering place for the Cabal as their dark influence spreads from Urborg

(Damage dealt by sources without infect causes loss of life

Whir of Invention [Aether Revolt Prerelease Promos] Elemental Let the weak react toSet: 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.