It's a great pleasure receiving positive feedback from a Champion player! Thanks a lot for passing by and I hope you'll my opinion will be helpful:
We expect a Zaku with ranged attacks and no magic with all my monsters pick at level 1:

• Mycelic Slipspawn will get destroyed so I won't pick it
• 1st position: Mycelic Infantry since he got shield (gets reduced damage)
• 2nd Centauri Mage: it'll return fire from Snipe monsters as well as from the blast damage when enemy hits the tank
• Queen Mycelia: Having extra Armor will especially help Centauri mage stay alive longer
• Scavo Hireling: with Repair it keeps reparing the armor of Mycelic Infrantry or Centauri Mage

I do believe these 4 monsters are good enough to put a fight against yodin, If mana cap isn't yet reached, adding Goblin Psychic and Doctor blight might help a lot.