Header Designer for Magic: the Gathering Mark Rosewater recently wrote that Universes Beyond allows for designs that just wouldnt have happened without the inspiration of an external intellectual property
All in all, I get the downsides they were contending with
When combat starts on your turn, Arahbo gives another Cat you control +3/+3 until the end of the turn, whether it's in play or in the command zone
Eh, you had six months of fun
That obviously makes the card scarce, and sellers have been able to name their price
Heggen reassures me that they are thoughtful about what new Secret Lair cards are doing to strategies outside of Commander, saying we're not trying to accidentally ruin those formats by casually printing hyper-powerful cards into them. That said, the concept of mechanically unique Secret Lair cards existing at all has been a hot topic in the community regardless of power level