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The sideboard takes advantage of the fact that the desire for colorless lands pushes the deck to have red mana to sideboard Fevered Visions, a card that has really impressed me against control decks, along with Gideon, Ally of Zendikar and a couple of counterspells

Up the Beanstalk isnt really a problem right now, but if Standard slows down after the next ban announcement, Dark Confidant could be the card that lets a bunch of smaller mana value decks tick

There are cards that are both threats and answers (such as Teferi, Hero of Dominaria or Sandwurm Convergence), but KernTheGerm gave us this nugget of wisdom: there are no wrong threats, only wrong answers

Nicholas Byrds Modern Open-winning version gives us an idea for what might be cut, with only three Pentad Prism (among other cuts, like Laboratory Maniac in the sideboard)