[Autumn]

A unit that has died to Cruel Commander should at the very least proc allied death effects. Currently this is not the case which makes it not synergize with effects that might rely on this, considering you are setting the youkai's hp to 0 I think this should be a thing.

[Snake]

We're very lacking on things to shake up the meta, honestly.

[renowner]

If the summoner is summoning a bunch as a build that requires 80 strength to function, that still isn't very scary. The fp drain is going to be pretty high.
Cruel commander being 5 rounds is fair in my opinion, and if it ends up too op for whatever reason, then it can be nerfed.

But the fact it kills a youkai, costs 3m, and prevents your summoning the entire time is in and of itself a pretty big drawback. Not to mention you're losing out on like, cloak of many colors and terrasque shells and what have you.