Theme boosters are intended for constructed formats, where buying a theme booster for your deck's colors gives you a nice, hefty chunk of cards ready to slot in
With the introduction of The Walking Dead cards, which would be legal in Commander, Legacy, and Vintage, the old Nexus of Fate conversation resurfaced what are players supposed to do when a deck featuring exclusive cards becomes a big player in the competitive metagame
He's the protagonist of the game if you didn't know that, and he's very popular with people who like men with big hairy chests
Plus, as I said with the Boots, its just a hammer and not really iconic with the character or the art
The second rule prevents you from having to restart the box too often because someone just decided to dump all their copies of Search the City
Including the set in Standard made me wonder if there were any existing hooks we could grab onto