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This is my first attempt at making a deck centered around Mutaforming. There are some core units that can already mutaform and together with the castle, you'll be able to have a lot of units with tokens on them.
The goal is to give extra health to strong hitting allies like Behemonth, Bushido of the Rose, Clan of the Oak and Cotlic. And have the more supportive units on the sides of the lanes generating mutaform tokens.
There is also a tribesmen package in here. This will help with controlling the minions and also give you some more strength. It also has great synergy with Cotlic, who you'll most likely be buffing to carry you through the game.