Whir of Invention [Aether Revolt Prerelease Promos] BW46 Then that player loses all

Then that player loses all unspent mana and you add the mana lost this way

"Four things that never meet do here unite To shed my blood and to ravage my heart

its power and toughness are each equal to the number of Forests you control

This effect lasts indefinitely

"Consider all confiscated items hostile until proven otherwise

Whir of Invention [Aether Revolt Prerelease Promos] BW46 Then that player loses allSet: 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.