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A great creature with Panharmonicon is Yarok, the Desecrated, a popular commander that functionally does the same thing but triggers every enter the battlefield of all permanents instead.

Cloudblazer seems to have flown right in from my 8th pick in Cube to join some other cards in a blink subtheme your commander wants nothing to do with

8 Wrenn and Seven Because seven ate nine

And while Lady Octopus, Inspired Inventor can cheat out plenty of the same giant Artifacts Arcum Dagsson is usually tutoring for, she gets exclusive access to some very unique Artifacts as well

Certainly it's a strong card that almost all blue decks will want, and Izzet spells decks will adore it