I've heard several people complain about having to add these dead Oracle cards because they simply have only one deck. In fact many people have only 1 deck and score is about the worst thing to determine whether or not someone "should be able to build a deck around an Oracle card". Especially given that higher score means you will need a wide upgraded card base instead of unupgraded.
I'd rather see cards more balanced out so that there's a wider variety of arena decks that can beat arena farmers and that there are more possible "successful" arena farmers. Ahh, if only...
Double draws have an entirely different balance than common decks and denial cards become all that more effective (especially Steal, Deflagration, Devourer, Black Hole, Nightmare and Silence). Balancing cards based on arena is bad, but current situation leaves much to be desired with an unbalanced arena. Changing arena to kick out double draws and changing point distribution to accommodate seems like the easiest solution (with an appropriate nerf to rewards), though that would overhaul arena entirely (for better or worse).