Welcome to the Official Redemption® Message Board!
inb4Gabe telling you it needs to be 50 cards to tell you that it needs to be 50 cards. If you're going to rely on standalone, you want max 4 blocks and to win very fast. So take out 6 cards, you can start with artifacts, I think 7 is too many.
Keep in captured Ark, I'd say. You can take out:Belshazzar's Banquet (you're rarely going to have initiative on only two guys, and since one is immune and the other is 7/7, make that basically never)Obadiah's Cave (It's really not worth it in my opinion)That's just my opinion, but that's what I'd take out. Your other suggestions sounded good.