Hideous End works too well with the Ascencion to be left out of this. I'd drop the Feasts of Blood to run it.
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Card advantage alone won't win the game. You need credible threats to take advantage of the extra cards. I'd run Snow-Covered Islands, and drop the Stalking Stones for two Scrying Sheets and two Rishadan Port. Drop the Leaden Fists and Excludes for Morphling and Force Spike, and I'm not too keen on the Rune Snags either. And Fact or Fiction would be a better inclusion than Whispers of the Muse. None of those cards should set you back too much, aside from Morphling, and even that can be substituted for any solid creature.