Bite Down on Crime is a common Sorcery card from Murders at Karlov Manor (MKM), collector number 154. Current market price: $0.07 (foil $0.06), TCGplayer market prices via Scryfall.
As an additional cost to cast this spell, you may collect evidence 6. This spell costs {2} less to cast if evidence was collected. (To collect evidence 6, exile cards with total mana value 6 or greater from your graveyard.) Target creature you control gets +2/+0 until end of turn. It deals damage equal to its power to target creature you don't control.