DONOTMIMICMYSTYLEOFMAKINGEVERYTHINGIMMORUSHES!!!!1111!!!
No, seriously, I've thought of this before. But I thought: What wouldn't be better with more draw power? So I tried hourglasses. Of course, Ghostmares are annoying.
This deck has nothing to protect it besides the occasional hand-lock. Unless you rush really fast, rushes generally has some difficulty vs >100HP opponents.
Plus, ghostmares doesn't really work without rewind spam. By saying spam I mean it. Only by using rewind (2-3 at once) and nightmare in the same turn can drawlock be achieved. It is super annoying when you use any rush against arena.
A side note is that immorushes/ghostmares are good arena decks, but not exactly the same thing when you use them, partly due to lack of quanta/card advantage respectively. In practice, speedbows and sosac grinders work best against arena (mummy grinder is as epic, but it has almost no attention, so...).
Now I'm publicly accused for making too many immorushes...