Seraphic Greatsword (CMR) from Commander Legends, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Craig J Spearing
• Card Text:
  Equipped creature gets +2/+2.
  Whenever equipped creature attacks the player with the most life or tied for most life, create a 4/4 white Angel creature token with flying that's tapped and attacking that player.
  Equip 4