I want to start off by saying fungus are extremely fun to play and i dont see a lot of people who use them. I suggest getting some Mycoloth's. (I know they are kind of expensive but it is an amazing fungus card). For any fungus deck that runs black you need DEATHSPORE THALLID. I also say put in more Utopia Mycons for the mana boost.
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I dont think the Doors would buff the saprolings. You would have to name "Saproling" as the creature type then play saproling spells for it to gain charge counters. It would work if you named fungus to buff all your fungus cards but not the Saprolings.