Do you guys used him?! I´m used and he seems a good hero, little overpriced so... Couldn´t be more fear if the is upgrade by a FAQ to level 3 wizard?
He's a decent character sure enough and the level 3 would be more than welcome seeing that he currently only has max 4 PD at his disposal. The ability to redeploy is absolutely golden, he knows the whole lore (50pts for a Slann), has a 5+ Ward Save (30pts magic item) and some nice additional abbilities. Combined with 100pts of level 2 skink priest = 75pts for the redeployement, re-rolling the comet and the One Use Only abbility to make Lore of Heavens spells irresistible on a roll of a double; really usefull if you have Lord Kroak or a Slann with heavens in your army aswel
Also if you do use him you may want to consider giving your Slann heavens. A slann with that many irrisitables rocks.