That is an interesting composition, but that's at least 25 mana. It can work, but Mycelic Slipspawn has 1 speed so you can't count on his damage very much, and almost all your damage comes from Return Fire. Don't know how much this would work, but to be honest Yodin Zaku has not many counters in lower leagues, the guy is just a freaking monster.

!PGMBOOST5