I don't have Morphers myself, so I'll have to settle for asking instead of trying it myself.
Why hasn't anyone mentioned Vargoth in Big Shaman lists? There seems to be plenty of good double-cast spells (albeit randomly chosen targets), such as Eureka!, Far Sight, Haunting Visions, Ferals and/or Frogs & Voodoo/A.Spirits.
Especially T10 Vargoth + Eureka! seems quite a swing play.
On a side-topic, how's Earthen Might with Akir or Fountains? Turning a morphed 4/4 into 6/6 is quite an upgrade, but maybe the deck needs more Elemental targets to justify two Mights.
You don't want Vargoth out of the morphers and you'll hate yourself everytime it happens, the other spells like far sight, spirit, voddo, visions and even lighting storm can be decent but the big problem is getting a vargoth out of morphers does effectively nothing.
The problem is that if you get vargoth with muckmorpher it';s not that good.. but saying that big priest DOES run barnes and the 6 cost spell that does what muckmorpher does
you can try vargoth.. specially without muckmorphers.
But that's what confuses me: Even when you get it from Morpher it's still cheap enough to combo with most spells... and Vargoth is high priority target anyway, so that just soaks a removal from your other threats.
Currently Big Shaman has very low count of minions, Vargoth just seems good enough without being overly greedy (like Big Bag Archmages, ironically)