Seraphic Greatsword is a mythic Artifact — Equipment card from Commander Legends (CMR), collector number 624. Current market price: $1.88 (foil $3.72), TCGplayer market prices via Scryfall.
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}