The Green/Black Dilemma: Stonewood Invoker!
Green/Black is a deck that wants to put on steadily increasing pressure in the form of larger and larger creatures backed by removal and some amounts of evasion. Creatures with an efficient ratio of power-to-casting-cost are paramount to this strategy, as there is no better way to make your opponent fold under your pressure… And Crypt Sliver has no synergy with any of the cards in Green.