Whir of Invention [Aether Revolt Prerelease Promos] Elemental Rogue Exile them at the beginning

Exile them at the beginning of the next end step

shuffle your library

Set: Dominaria Prerelease Promos Type: Legendary Planeswalker — Karn Rarity: Mythic Cost: {4} +1: Reveal the top two cards of your library

"Each syllable chills your veins

Whir of Invention [Aether Revolt Prerelease Promos] Elemental Rogue Exile them at the beginningSet: 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.