Seems interesting. You've clearly prioritized efficient mana usage, even to the extent of using some less powerful cards (Expunge, Miscalculate), but it all serves the purpose of finding the big expensive cards and playing them. You've got some cheeky combos, like Vial Smasher and Delve, or Blasphemous Act. I'm not sold on the miracles though. I didn't see a way to reliably get them to be discounted.