then blind his genies firstly because if he continue to summon elementals,his genies will rush out by making place for the elementals.
then exhaust his manas,he just use 'haste' if I cast 'slow',and he never use other spells after summon several earth elementals.
so I cast 'slow' every turn until he has little manas.
![Image](http://www.gamerhome.net/bbs/data/attachment/forum/month_1012/10121216346e4f83c618ac24b3.jpg)