Veteran's Armaments is a uncommon Kindred Artifact — Soldier Equipment card from Morningtide (MOR), collector number 146. Current market price: $0.30 (foil $3.50), TCGplayer market prices via Scryfall.
Equipped creature has "Whenever this creature attacks or blocks, it gets +1/+1 until end of turn for each attacking creature." Whenever a Soldier creature enters, you may attach this Equipment to it. Equip {2}