Hi ajstamm,
I've copied the reply to your question from the kickstarter comments below. I think you added a question on creating a new card here. The creature card represents the creature itself, so you can treat it as such. When the gods interact with it, you may change it to reflect any transformation it has undergone, as you would with any other creation.
Copy-paste of Kickstarter reply:
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Incarnis was not designed with solo play as a core focus, but it is something we want to encourage and support, so any feedback in this regard is much appreciated. The module Feuding Pantheons on page 34-35 includes automa which we think can be dropped into a solo game nicely to add some agency outside of your own control.
You are exactly right about the landmarks. In Incarnis, Domains are what make things mythical. So a 'mundane' city has a form (this could simply be 'city'), but does not have a domain yet. As you say, it can receive a domain during play and become something mythical. A Sky city, an underwater city or even a new god.
Fabled creatures are first and foremost creatures rather than places. During playtesting, we received feedback that it was confusing to call a creature a landmark, so we phrased this as a creature dwelling. Either way, the intention is simply that you create fabled creatures and give them a place in your play area. Feel free to move and change your creature around as your fiction demands!
We hope you have fun with the game. Please feel free to message us if you have any more questions or feedback.