What if you were to add in "Life and Limb" and "Liliana of the Dark Realms" as well as "Contagion Clasp", "Contagion Engine" or "Plaguemaw Beast"? Life and limb and a Liliana of the Dark Realms would interact nicely with an Urborg, tomb of yawgmoth on the field and a ton of saproling tokens and the cards to help proliferate would help add counters onto the different thallids as well as add counters onto ghave.
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