I greatly enjoyed this article. I find it a great shame that this is only a yearly series.
I'd also be interested in a series that is about what article 1 said the series would be about - the nitty gritty that we haven't hear about. Maybe this could be twice-yearly, with an article aimed at amateur designers in February and an article following the idea of the original 'nuts & bolts' in August/September.
I'd just like to reiterate how useful this article was to me. I'm starting work on a board game and though it's not much like MtG, there's a lot of cross-transferrable info in this article. I'll be referring back to it a few times, I'm sure.
Just in case you, Maro, aren't sure whether this is worth continuing, I would honestly state that this and State of Design are regularly my 2 favourites of the year. I notice a lack of responses on this forum but I imagine that's simply because there's nothing to dispute - not because people aren't reading and finding this useful.
I echo these sentiments entirely. As an admin of a site dedicated to custom cardset creation, these articles are gold dust to our community.