Criminal Past is a uncommon Legendary Enchantment — Background card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 122. Current market price: $0.27 (foil $0.29), TCGplayer market prices via Scryfall.
Commander creatures you own have menace and "This creature gets +X/+0, where X is the number of creature cards in your graveyard." (A creature with menace can't be blocked except by two or more creatures.)
All Commander Legends: Battle for Baldur's Gate cards and prices