I had a shadow deck loosely based on that method. There was: an artifact that decreased cycling costs by 2 an artifact that let mana be played untapped a bunch of monsters with a cycle cost of 2 where the cycle benefit was adding a mana a spell to search your deck for mana for each creature in your grave and one dealing X/X damage per shadow mana tapped. It was about the only thing I found that could reliably beat a sliver deck, but if you didn’t get the artifacts you were screwed.