User blog comment:KachiExa/Servant's Best Craft Essence Guide-4★/@comment-28137023-20180530050402

I think Prisma Cosmos would work really well on the Shielder.

Also, rather than "Formal Craft" which has boosts only on Arts cards, Craft Essences which supports Arts & Buster cards like "Battle Olympia" and "Detective Edmond ~Foreign Nation Infiltration Arc~" would work really well on Nameless.