OK well the summon is simple: the AI will always summon 1 card
so if has high resource can summon/play a more expensive card, but otherwise, it will still play just one.
I am going to leave as it is for two reasons:
1) after messing up a bit, I have no clue how to change this, so I should ask Anima and I think he's currently busy
2) even if I successfully change this, all the campaign battles would change (be MUCH harder). And doing this now would be suicide since they are all tested and well balanced already