The owner of this deck hasn't added a sideboard, they probably should...
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You could add Forbidden Orchard to give your opponent more creatures for Defense of the Heart. Avatar of Might or Inkwell Laeviathan could be of interest, too.
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I'd love to see your opponents face when you drop a Darksteel Colossus at turn 5, you might consider getting an enchantment or something to give your Colossus trample?