The owner of this deck hasn't added a sideboard, they probably should...
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Cipher abilities make a copy of that card that you may cast. Heroic triggers off of targeted abilities of casted spells. Hidden Strings targets two permanents. Just untap your Heroic creatures after swinging in with them and it's great synergy, though, there's much more you can do with Hidden Strings.
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Not bad, although I would suggest more creatures. Maybe some Phalanx Leaders? If you play Thassa and Aqueous Form, maybe Bident of Thassa would also be a good idea.
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you could move the Syncopates and Render Silent to the sideboard in favor of Cloudfin Raptor and Judge's Familiar.