Indeed. That resist effect could be an interesting idea for PvP but of course I never seen any PvP build use it, well maybe a few, then the elemental attacks.
Neat idea: Elements+ Mirrorcast+specialist+ clearcast, etc , makes crazy attacks.
There was another one also with meteors and procs constantly raining down for many seconds. There are many possibilities with its 37.5% chance to trigger same spell with different element.