Maelstrom Portal on a stick, eh? Seems very powerful and might be an auto-include in Aggro Overload Shaman. Apart from that, it can be gotten via Menacing Nimbus in case Elemental/Mid Range Shaman might have a comeback.
I think its a solid arena card. Ok stats for 2 mana, a small board clear (specialy good against those reborn minions and all the lackeys) and its an elementa. Its like "Twillight Flamecaller" with the overload. I rate this card for arena a 3/5. Would pick one for sure.