Well, it took my Necromancer 3 tries covering 4+ hours, all 3 of the Triage cards I had, and 1 Myth and 8 life Henchmen, but I solo'd Shadow Ghost Dog. Don't bother trying him at all without Triage. Well, maybe the other 6 schools can, But Death School versus Death School means long, slow, BORING fights, and Ghost Dog's cheats are very powerful in long battles.
Maybe I'll go watch some grass growing; that sounds more exciting and fun right now.
