I used to use the Death's Shadow in a Suicide Black Storm list utilizing Night's Whispers and the plethora of BBB, lose half you life, draw 4 cards that are available. That way if they flustered/MBT my Tendrils, I could drop a Shadow or 2, and win through a swing the next turn. I could totally see adding in a number of Berserks/Veil of Summer to the list, and go big in either direction.
@BlindTherapy Why would it need to be human? No need for cavern, it's already uncounterable. And it makes FoV, KotR, Teeg, GSZ, Dr. Shaman, Ouphe, etc etc all uncounterable as well. In the right list, you could "almost" get away with zero caverns, letting you run more fetches, wastelands, and a more stable 4-5c list utilizing duals/fetches and Dr. Shamans/Noble Heirarchs.
I was looking at this card more as a counterspell versuses removal, where I can turn my Mentor/Delver/Pyro into a equal threat when they go to kill it. With the side ability of removing a Tinker Bot to give you an extra turn or 2, or removing a narset/leo so you can draw cards again.