You mentioned that all players need to easily "get" what a world is about. Fair point. It's a balancing act, though, because in a continuing series (like Magic) where there's no end in sight, if you don't develop your worlds and your characters beyond "five words" caricatures, the Vorthosy people eventually find that the story has gotten repetitive for them. The game's potential audience is not infinite, so keeping an audience in the long-term is as important as keeping them in the short-term.

A world having a simple identity to grok doesn’t mean it can’t be deep in details. Innistrad might be “gothic horror world” but that doesn’t mean it can’t make Vorthoses happy.

Why was Tarmogoyf, Bob and Vendilion Clique raised to mythic rarity in the first Modern Masters? Were you just scared of experiencing a Chronicles 2.0? In the past you have said that complexity and balancing for limited formats define the rarity of a card. Are there going to be any changes to the rarity of cards that are going to be in Modern Masters 2015?

I said those two were the major factors. They are not the only ones. The tricky balancing act of Modern Masters products is getting the cards into the hands of players who don’t own them without destroying the value of the cards for players who do own them.