I just want to express my opinion that this secret lair is a very very dangerous slope to go down. Have you guys not learned from Nalthni Dragon/Nexus of fate? Also these are essentially being printed directly to the reserved list since WOTC won’t own the licensing forever, which is something stated wouldn’t happen.
While the Secret Lair is the one chance to get the Walking Dead versions of these cards, we have the ability to print the Magic versions of these cards in future products. So, let’s say Negan becomes a popular Commander, we can print the Magic version (same card mechanically, but with a Magic name and art) in any number of future products. This is not a case of us being unable to make more of a popularly played card.