Bite Down on Crime [Murders at Karlov Manor]

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.