Sword of Truth and Justice is a mythic Artifact — Equipment card from Modern Horizons (MH1), collector number 229. Current market price: $28.46 (foil $42.28), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has protection from white and from blue. Whenever equipped creature deals combat damage to a player, put a +1/+1 counter on a creature you control, then proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) Equip {2}