Metallic Rebuke [Aether Revolt]

Set:	Aether Revolt
Type:	Instant
Rarity:	Common
Cost:	{2}{U}

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Counter target spell unless its controller pays {3}. "Too little, too late. The machine is in motion." —Tezzeret