There isn't really a level of sorts. That's the jist of it; there's one AI that after 50 or so games starts to learn from you...or so it seems. I'm still playing the offline AI when I can, and they're definitely getting better with their Wall placements, so perhaps that is something?
Summoner Wars Compendium Stats
Total Games Played: 6,569 (49.21% overall win rate)
Regular Games Played: 2,241 (57.6% win rate)
Custom Games Played: 3,417 (40.6% win rate)
Other: 911 (61.0% win rate)
(Updated May 10)
The night's shadow exists, not sleeping at all,
The toil of the light is its only call,
Behind the scenes lurking with shadowy gall,
Its face never showing; height never too tall.