Rope Line Attendant and Transforming Creatures
Not sure if this extends to other perpetual effects but there's an interaction between Rope Line Attendant and Ajani, Nacatl Paraiah that feels unintended. Setup:
Player 1 casts and resolves Rope Line Attendant while they have Ajani, Nacatl Paraiah in their hand. This grants the perpetual ability "When this creature enters, create a 1/1 green and white Citizen creature token." However, the Attendant (seemingly incorrectly) grants this ability to both sides of the flipwalker, and upon transformation, Ajani, Nacatl Avenger has this ability trigger and creates a 1/1, despite not having "Creature" in its type line.
Moistnar#18498
shared this idea
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Rezzahan#77802
commented
The card was a creature card in the hand, and thus gained the triggered ability. Since ability granting is a layer effect (layer 6), and "perpetual" makes the card retain such effects over zone changes, the effect applies to the card whereever it goes and however it looks. Ajani not being a creature is irrelevant, it was as creature card when it gained the ability, so it has the ability. No bug.