User blog comment:Ex2456/Ice Prison Emperor, Cocytus Greed - Deck/@comment-5777478-20150513235643/@comment-26069426-20150514154345

There isn't that much support for Ancient World. If you listed out every card that Genma uses, and removed them from the list, and you took 4x of every remaining card, I don't think you could hit the 50-card minimum requirement.

And if you could, the deck would be so unfocused, lacking synergy as it would.

The reason why certain cards are considered staples is because they drive the winning image, and, unfortunately, a lot of Genma's cards are staples.

A goal like this would be better off using Dragon World.