They are supported by the Commander staples that define their colors
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Instead, Mono-Blue often wins by drawing four cards, untapping three permanents, copying a spell, flickering an Artifact multiple times, and then saying, "I would like to present an infinite loop from here." And to help you get to that point in the game, a great Mono-Blue Commander should be able to give you repeatable value in one form or another
Its cost is relatively high, but it doesnt require much to equip, its typing interacts with Kaito, Bane of Nightmares, and Dimir Tempo lists currently use plenty of cheap creatures with flying, making it a way to turn any of them into an efficient clock and hand filtering, not to mention potential instant-wins with Dig Through Time and the like
So we'll make sure that we fill the deck with other ways to mill players to trigger our commander's abilities more often