I mean, you can think of a lot of combo's
1) cast + regrowth
2) bim shalla + cleric
3) he's ready after the clerics action
1) cast + bim
2) bim + bim
3) Before his action, he is ready
This can be combined with temple of light and the 3 bim shalla's can give melee +3 from turn 4 onward. teleport, buffs, cheetah, divine intervention, ... All ways to get him out of the starting zone from turn 3 onward.
He's not even priest(ess) only, so nature mages or warlords might use him. Other ways to heal are the spring, mohktari, or even a simple minor heal or mend ... It seems very very hard to stop from gaining his 5 dice since you would have to anticipate in turn 2. Only aggressive warlocks would have no problem doing it.
Seems really, really, really strong.