Fetchlands are so universally popular that Gogo has a good chance of being run in many blue decks for that interaction alone, those without green in particular
The untap and pump combination means that all of your instants become combat tricks, and if the power of Ponder and Preordain has taught us anything, it should be obvious that tagging a loot onto every non-creature spell we cast is quite powerful
If your Commander deck is weak or slow because it's following a specific gimmick (such as only including cards where there are hats in the art), then bracket one is likely where your deck is going to be
How does Curiosa calculate Pokemon card values
It already passively shapes up your hand, but it enables so many things from discard decks to madness/mayhem to cast-from-exile strategies that just want another payoff for playing their game
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