The owner of this deck hasn't added a sideboard, they probably should...
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Capitalizing on Delver of Secrets and Markov Blademaster. I have no idea if this is viable but any input is great. Also this is for the standard format.
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Chandra's Phoenix > Blademaster Sword of War and Peace > Trepanation Blade (would alter the equipment number to be 2/2 Pike/Sword) Snapcaster x2(or Grim Lavamancer) + Invisible Stalker x2 > Stormkirk noble Gitaxian Probe > Think Twice Vapor Snag > Artful dodge Galvanic Blast > Arc Trail (Sideboard Arc Trail for sure) You could also try to squeeze Chandra, the Firebrand in here somewhere. She's overlooked in standard and insanely powerful.
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I'd also add a single Forest to the deck that you can fetch with Evolving Wilds. With the singleton Forest, you can sideboard Anceint Grudge and be able to pay the Flashback.