Your search for "knockout maneuver 54" revealed the following:
Knockout Maneuver (SOA) from Secrets of Strixhaven Mystical Archive, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Olena Richards Card Text:Put a +1/+1 counter on target creature you control, then it deals damage equal to its power to...
Knockout Maneuver - Japanese (SOA) from Secrets of Strixhaven Mystical Archive, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Shusaku Sato Card Text:Put a +1/+1 counter on target creature you control, then it deals damage equal to its...
Knockout Maneuver (Foil) (SOA) from Secrets of Strixhaven Mystical Archive, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Olena Richards Card Text:Put a +1/+1 counter on target creature you control, then it deals damage equal to its power...
Knockout Maneuver (TDM) from Tarkir: Dragonstorm, available at 401 Games Canada. Rarity: Uncommon Finish: Normal Artist: Aaron J. Riley Card Text:Put a +1/+1 counter on target creature you control, then it deals damage equal to its power to target creature...
Knockout Maneuver (Foil) (TDM) from Tarkir: Dragonstorm, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Aaron J. Riley Card Text:Put a +1/+1 counter on target creature you control, then it deals damage equal to its power to target...
Knockout Maneuver - JP Silver Scroll (Foil) (SOA) from Secrets of Strixhaven Mystical Archive, available at 401 Games Canada. Rarity: Uncommon Finish: Foil Artist: Shusaku Sato Card Text:Put a +1/+1 counter on target creature you control, then it deals damage...