Whir of Invention [Aether Revolt Prerelease Promos] Foil Players can't pay life or

Players can't pay life or sacrifice creatures to cast spells or activate abilities

except for creatures that couldn't attack

*Weatherlight* navigator

{T}: Prevent all combat damage that would be dealt this turn

If the creature that spell becomes as it resolves has not been turned face up and would assign or deal damage

Whir of Invention [Aether Revolt Prerelease Promos] Foil Players can't pay life orSet: 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.