Mycoloth and Utopia Mycon are each fungus and very good, but try lookin up the rest of the green fungus. Over 90% of them are upkeep based and make tokens similar to Utopia Mycon, but some also multiply how fast other fungus make tokens. "Thallid"<- good keyword to start with
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I just made something really similar, but I only used token makers that made saprolings and threw in 4x Fist of iron wood + 4x Coat of Arms for unfair- super tokens. Imagine having 10 tokens out, ready to attack, but first you play coat of arms so they all become 10/10's. Now attack ;)