This deck truly fits the bill for a "Cruel Control" deck, it involves starting the game slow and controlling the board until you can get Shirei, a reliable instant speed sack outlet (preferably one of the altars), and some creatures you can pop back over and over again because of their power - Blood Artist and Grave Pact become musts once you get going to remain in control of the board!

I'm always looking for better cards to pop in, including sack outlets, control cards, ways to deal with permanents like Rest in Peace and Leyline of the Void, better ways to protect Shirei, and more 1/0 power creatures that do funny things when they die/hit the board.