In his ongoing “Lessons Learned” series, Mark Rosewater walks through every set for which he’s led or co-led design and talks about what he learned.
Here are his previous three articles:
Last time he got through original Theros and he starts here with Khans of Tarkir.
Man, crazy that energy almost premiered all the way back in mirrodin. And that Sultai almost didn’t exist at all (my Sidisi!).