If we count Manic Miners sculpts, and if he is going to a Mauler and I think he said wolf clan you could do a Wolf Totem and any wolf clan he doesn't do, for example a new Wolf Legion (2 models + a leader, and if it has a standard perhaps you can do something where we can attach a bit.
This way, the army list that got the lease love from Target, the Wolf Clan will be fieldable.
I already know the Impaler is a good option
Since the Crusher by Excelsior rocked, but is out of print, that is another good option and a generalized model that could be used for many purposes as an elemental type.
The model I think most people would love is a Swamp Fiend.
The Novice Shaman model for swamp goblins too, a great model to have