Sparring Collar (5DN) from Fifth Dawn, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Christopher Moeller
• Card Text:
  Equipped creature has first strike.
  RR: Attach Sparring Collar to target creature you control.
  Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)