Whir of Invention (49p) [Aether Revolt Promos] XY Flashfire Whenever a creature you control

Whenever a creature you control becomes the target of a spell

You may reveal a Dragon card from among them and put it into your hand

If you don't or can't make an exchange

sacrifice it unless you exile another Merfolk you control

Whir of Invention (49p) [Aether Revolt Promos] XY Flashfire Whenever a creature you controlSet: Aether Revolt 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.