Katanas are certainly easier to come by because of the Cyclopses, and I’ve surprisingly obtained 3 armors, but the Deathmages are definitely the hardest part of the set for me. I’ve learned how to map read and what some of the rng points of the Realm are because of my hunts for them, but I the thing that gets me is that I’ve often been beaten to the punch with them, even if I find their locations, even in dead Realms!
Oasis Giants are good if I’m on a fast character, but though I share the sentiment of sharing hits, I’ve frequently got to be the first one there, else others teleport to me when I’m close and don’t have the same kind of courtesy.
In my limited experience as an ST collector, the rarest set of them all feels like the Raijin Disciple, even if it potentially might “actually” have similar chances as everything else. Out of all court dungeons and endgame content, that has been the most miserable to hunt. I just obtained the star a few days ago since the set’s release. I’ve had at least 2 pieces to every other non-reskin set in the game up to the point, not counting duplicates.