Your search for "Unwinding Clock 61" revealed the following:
Unwinding Clock (BRR) from The Brothers' War Retro Artifacts, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock (NPH) from New Phyrexia, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock (TRC) from Star Trek Commander, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Miklós Ligeti Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock (C18) from Commander 2018, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock - NPH Reprint (PLST) from The List, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock - Schematic Art (BRR) from The Brothers' War Retro Artifacts, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: David Astruga Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock (Foil) (NPH) from New Phyrexia, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock (Foil) (BRR) from The Brothers' War Retro Artifacts, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: Mike Bierek Card Text:Untap all artifacts you control during each other player's untap step.
Unwinding Clock - Schematic Art (Foil) (BRR) from The Brothers' War Retro Artifacts, available at 401 Games Canada. Rarity: Rare Finish: Foil Artist: David Astruga Card Text:Untap all artifacts you control during each other player's untap step.