Haven't played with the wood elves on AB for any length of time but instantly noticed eternal guard should be core not special. Gonna be looking at a tourny list soon so may find more.
Playing with a moulder themed list for Skaven: when you create a unit of 4 rat ogres with 2 packmasters, then upgrade to a master moulder and master-bred Rat ogre the second packmaster disapears and cannot be reinstated. This also happens with larger units
Wolfie