Hey! :)
You're right, Obsidian Dagger is a good idea and another way to let my opponents sleep. Satyr Hypnotist usually is not surviving 3-4 turns. I just have to be sure that I'll get the Relic removals from sanctum before my opponent.
Thalia is very interesting since the change but I don't have the feeling that I can fit her very well. Maybe with Obsidian Dagger I'll have a better timing to use Thalia. Also "Nightmare" or "Darkdream Hex" would be options as more or other removals. I think that I should try it. :)