Kami of the Waning Moon has 4 things wrong with it:

1) It's set to be played after combat, as are seemingly all other spirits. This makes him not work (and it also makes making a functional Spirit deck for the AI literally impossible, as it also affects other spritis). I edited him to be played only before combat, and I also edited Ashen-Skin Zubera to be playable only before combat and this made a deck featuring just the two of them play right in this respect.

Unless there isn't something I can't see right now, I suggest at least changing those two for now.

2) The AI will stack Kami of the Waning Moon activations on the same creature. They are redundant. EDIT: I understand that if it only has one creature to target it has to target the same creature, but it tends to stack them on the same creature even if it has other targets).

3) The AI will also target/stack those activations on a creature that already can't be blocked, which is also redundant (although I'm not sure if anything can be done about that right now, but if yes, by all means please do) EDIT: I've seen it play it properly, too, but I've also seen it do it spectacularly wrong.

4) If the AI has other spirits (like Ashen-Skin Zubera) in hand at the same time as Kami of the Waning Moon it will play them first and then Kami of the Waning Moon. This is obviously counter-productive. Again, if nothing can be done for now, ok, but this sort of thing needs long-term looking into. EDIT: At the very least the problem is that it's choosing to play an Ashen-Skin Zubera over a flying creature somehow.