Unwinding Clock (Retro Schematic) [The Brothers' War Retro Artifacts] Special Colorless Energy Unveiling Ultimate Guard's "Katana Sleeves"

Unveiling Ultimate Guard's "Katana Sleeves" – the pinnacle of card protection

Creatures you control can boast twice during each of your turns rather than once

and briefly

[2L] Thunderspark (40)

Unwinding Clock (Retro Schematic) [The Brothers' War Retro Artifacts] Special Colorless Energy Unveiling Ultimate Guard's "Katana Sleeves"Set: The Brothers' War Retro Artifacts Type: Artifact Rarity: Rare Cost: {4} Untap all artifacts you control during each other player's untap step. "Heat from the rotating mechanism is captured and converted into energy, allowing it to operate in perpetuity." *Rusko's Compendium of Clockwork"