Errand of Duty is a common Instant card from Alliances (ALL), collector number 2b. Current market price: $0.22, TCGplayer market prices via Scryfall.
Create a 1/1 white Knight creature token with banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)