when I faced an half-blood (lumal the light-life) he had some big green and white big dragons, and an extra pumped forest spectre (59/59 lol WTF!!!) and some mitosis in hand. he played the mitosis on the spectre, even thoug he had poor water quanta left, while having both life and light 75... and he kept casting new specter (that where 2/3 ofc)... it didn't mattered to me, I would have EM him even without that mistake, but still... it is pretty stupid to do lol!!! I think the AI choose the target of mitosis without considering the quanta, and just considering the current strenght of the creature, and not the original one.
I wish I helped