They won't mind this in 40-life formats like Commander early or midgame, and they can draw answers to it when it becomes an issue and as your Commander you don't have access to Blue for countering their answers
Genuine cards show a thin, even structure
I think Charming Prince is a phenomenal addition to the archetype, giving you a virtual Phantasmal Image that works better on its own without being vulnerable to your weaker draws or random targeted stuff from the opponent
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Kaya's Guile looks like a very strong card for decks that want it, like Esper or Mardu builds that may struggle to make it to later turns against a variety of different strategies
I like this card more than Vizier of the Menagerie because it decouples the creature from the card draw engine