This is a good one, nice catch! I never even thought about the Lore Attribute, but in a Tomb Kings army it would be very useful. Your MWBD strategy is an excellent use of it, as would using it to protect your Hierophant by teleporting him out of tricky situations. Also a bit of a risker strategy would be to teleport in a Destroyer of Eternities TK to do his work against an enemy monster. All in all, it has some great applications, especially in an army that is slow and has the majority/all of its characters of the same troop type. Mindrazor instantly helps solve the anti-armour issue that Tomb Kings have. That would be a huge plus. I really like the idea of the Lore of Metal and you have sold me on the Lore of Shadow. I think either of those options would work well. I've never been a fan of the Lore of Fire (my least favourite BRB lore, followed by Heavens), so I wouldn't field it myself, but you do provide an insightful analysis on its behalf.