1. No limit. (Technically same plane)
2. Random spot
3. Sept 2016 TGC provides for monstrous Skeletons (which can go to Class III), Oct 2016 TGC for monstrous Skeletons, November 2016 provides The Lament (Class III to V), Oct 2015 for The Ghost (III to V), Nov 2015 for the Ghoul (I and II)
Best wishes,
Nicholas