[quote=@64-Hit Combo]
[@Archmage MC] You mention that you're worried about the shikai I described, but do you mind if I ask what in particular worries you about it? I put a number of prohibitions on it to make it reasonable, but is there something abusive about it that I'm not thinking of? Criticisms and suggestions are welcome.
[/quote]

Well Portals or anything that meddles with a fundamental of physics like time or Space are inherently broken. whats stopping your character from getting people into a monologue like whats normal in anime, then just putting a rock inside their brain, instantly killing pretty much anything without 682 or deadpool regeneration? 

Stuff like that.