Unwinding Clock (Schematic) (Serial Numbered)

Untap all artifacts you control during each other player's untap step. A numbered series of 500 copies of this card was found within the The Brothers' War Collector Booster product. The number on the card you receive will vary from the number pictured in the listing unless otherwise shown in a Listing with Photo.

"Heat from the rotating mechanism is captured and converted into energy, allowing it to operate in perpetuity." —Rusko's Compendium of Clockwork