I'm still working on figuring out a way to make it not slow as fuck, but I made a funny
>Impulse Fields + Blessing of Avalon allows him to survive double-hit attacks as long as he starts above 50% HP
>Retaliation guarantees crit counterattack
>If he does more than 66% enemy HP, Blood Absorbing Sword pushes him back up above Impulse Fields' threshold
>regardless of whether he kills or not, Soul Stealer restores vigor to re-enable Blessing of Avalon
Tested against Skeleton Masks on Overlapping Coincidence with challenge mode on and they couldn't kill him, but he AT'd himself badly on turn 1 and never got to move again for the entire rest of the map.
Kinda want to get rid of Forestallment because it doesn't help that much without Sen no Sen, but I can't think of anything better to put in except maybe Muscle Burst, and I can't get rid of the slot because I need Keyboard Warrior's property limit for his Defence slots.