I've never actually seen anyone use this with Death Spark, but Squee has built in recursion.
I think an important question is which spellshapers to use. There are a few (not a plethora, but enough for your purposes) decent red ones which could have plenty of ammunition under Death Spark and...
If Nicol Bolas were in the decklist, that work. As it is, most of the creatures in the deck are poor targets for Shallow Grave, although I suppose a few are bombs...
...cobblers, who stewed Jimbot, ate him, and died from food poisoning. So now, Jimbot, in a moment of transcendental meditation, realized that he had just killed his brother and would now...
Yes, I realize that. Most competitive Vintage decks are as expensive. Many are more expensive (especially the ones that run Workshops). I do actually have most of these cards. The only ones that would be trouble are the most expensive ones (I wish it were the other way around).
Actually, I...
Train: I'm not sure about Mutations. It seems that it would work, although I don't know if the boost (albeit a very nice one) is worth it.
DarthFerret: Seasinger is an unorthodox choice. It is expensive (for Fish) and not very flexible, but it does pack a nice punch against certain decks. Has...
It would drastically change the deck though. I guess the question is whether or not it is a superior strategy (and if the deckbuilder has access to those cards).