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Heartless Summoning is obviously key here, and as such, you should probably try and include some search for it. My first thought was to switch out Remand for Muddle the Mixture as it can transmute for both Heartless Summoning and Myr Retriever, but then I realised it requires {U}{U} to cast and {1}{U}{U} to transmute, and that's a little heavy on blue for this deck. I still think some search is needed, though I can't think of anything at the moment.
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the main "search" is just lots of draw. Solemn/remand can get you a good bit of the way, I hope.