Notes & Combos
I hope the Exosister players of the world will forgive me. I genuinely think this is a lot stronger than playing the deck pure.
Loosely based on Dave Trepanier's Montreal WCQ Top 4, though this one leans a little more into Exosister names. In case you were wondering, the gimmick is that Realm is like a Sakitama sidegrade (I will never forgive Konami for making Sakitama a UR), with your level 4 of choice equipping Claw triggering Martha's effect. This makes Claw + Martha into Magnifica + Returnia, while Realm is always nice as an extender.
If you have Sakitama, I'd recommend playing it over the 1 of Exosister names (and probably replacing the 2 Stella as well). Similarly, running a second Rexterm over the second Stealthbergia is optimal, as it plays better into Unicorn. Chaos Angel isn't bad to go into either if you have extra Claw in hand, and can be justification to run 3 Claw if you have it.
I would have played a spicier Exosister build for Duelist Cup, but no normal summon I could think of was more impactful than Therizia while under Martha's xenolock (the closest I could get was Barrier Statue of the Heavens).