I found silver can setbehave = face; yestoday.
I try and find that not work at all.Andbehave = face; bring more wrong plays, such as stealth monster would not attack sometime.
Either silver or default AI do not have a mode only hit enemy's face.
It would be efficient to use T7 hunter even if only hit face.

Actually, T7 hunter should not attack any enemy monster except something like Knife Juggler .And make a good choice when enemy place a Taunt monster, slient it or attack it

It should consider when put a mad scientist and how to make maximun damage to emeny face every turn(use hero skill or place a monster which would make enemy lost more blood in future)
I also found some T7 DeckRule for default AI which use 21 Leper Gnome to attack 21 Ironbeak Owl ...
Wonder why there is not a face only mode....