Fervent Champion (ELD) from Throne of Eldraine, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Steve Argyle
• Card Text:
  First strike, haste
  Whenever Fervent Champion attacks, another target attacking Knight you control gets +1/+0 until end of turn.
  Equip abilities you activate that target Fervent Champion cost 3 less to activate.