So, Ive been thinking on one small story to add to the anthology. I want to include a story focusing on an old conspiracist with things to say about 'sightings' and other details he allegedly has with Planeswalkers, though told rather vaguely from this old man's point of view. Considering SO many people frequent Ravnica. (Jace, Liliana, Chandra, Garruk, Dack, Domri, Gideon, Nicol Bolas? Nissa, Ral, Tezzeret, Vraska, Ramaz, Vronos, etc) so while he may not have had but a few sightings of a few different Planeswalkers (and perhaps some suspicions about some combination of Jace, Gideon, Ral, Domri, Vraska, etc) and him ranting about these sightings and what he thinks he knows, giving him a reputation as a conspiracy theorist at best, and a lunatic at worst.
Hmm. Depending on how you do it, I think that might make an interesting concept. There are a number of ways you could go with it. He could just be some old man who was often in the right place at the right time, or maybe he was a member of the Wojek, or he owned a tavern 'walkers favored for some reason. It could be pretty fun, really.
Just remember that during the Guildpact, Ravnica was shut off to 'walkers, so you'll have to set it post-Dissension, but most of those 'walkers fit that, anyway.