Being able to play a combo deck that has a fairly consistent turn one or two goldfish kill and also gets to play four Force of Will as well as additional combo protection is just awesome
A touch slower than Delver but far more consistent overall

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Empty the Pits is an incredible finisher very much along the lines of Psychatog but with a better conversion rate
Some characters, like Yshtola, have such deep character development throughout portions of their game
The life drain abilities seal the deal, turning Sheoldred into a clock even if it must remain defensive