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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.