What is marvellian stanza?

There is no recognized poetic form or stanza structure called "Marvellian". This term is not found in poetry literature or dictionaries. It's likely a made-up term.

It's possible that you are thinking of a specific poem or work related to the Marvel universe. Could you please provide more context or information about where you encountered this term?

For example, are you referring to:

* A specific poem or work by a Marvel writer/artist?

* A fan-created poetic style?

* A unique aspect of a particular Marvel comic?

With more information, I might be able to help you understand what you're looking for.