>>535733742
I can imagine the counterforce opened up by sending demigods and the like, so Muramasa would have the zero mana cost and anti-Divine bonus functional.
Unlike LB6 where he only had the weird immortality. Doesn't sound like much, but his ability runs on using UBW to produce a ton of swords until he makes an actual good one. Having zero cost means he will be spamming the 100% perfect swords instead.