A combination of Doom Blade and Go For The Throat gives you a bit more range to work with. Murder has no target limitations, but is a little pricier. Depending on your local meta, Victim of Night may be a good choice as well. These are cheap and will help you with a little more control than your creature only approach. As mentioned, Pillar of Flame and Arc Trail, would be a great addition as well to cut down on undying issues and bypass things that avoid black removal like Knight of Glory.
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