Cards like Sneak Attack and Show and Tell pair well with the large Demon, and dont require additional steps to get it into the graveyard
Souvenir Snatcher It will be good enough if you gain control of one artifact with Souvenir Snatcher, but why stop there
Light your path
Play Rule #13 states: Abilities which refer to other cards owned outside the game (Wishes, Spawnsire, Research, Ring of Ma'ruf) do not function in Commander without prior agreement on their scope from the playgroup. Therefore, Spike is twice banned in Commander, and even if Unstable were allowed, Spike wouldnt be able to be played
Super fun when you can throw a Phyrexian Metamorph under it
So use a guide, try it out, and rework the deck if it isnt working