Whir of Invention [Aether Revolt Promos] Cat Glimmer Whenever another nontoken artifact enters

Whenever another nontoken artifact enters the battlefield under your control

Each other creature you control that's a Cat

Each winter

the Hauntwoods churn like a viper's nest

Then discard two cards unless you discard a creature card

Whir of Invention [Aether Revolt Promos] Cat Glimmer Whenever another nontoken artifact entersSet: 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.