I’m going to start this series with an easy one that I know works well… “JDH”. A common way to mix up Commander games is to restrict the cardpool to provide fewer “obviously correct” choices and more room for interesting deckbuilding. Brawl is one popular version of this, but tries to serve too many masters, and the rotating nature isn’t for everyone… to build in just 4-6 sets, it was necessary to loosen the restrictions drastically.
Whether you’re trying to keep yourself in check (vs a playgroup that maybe isn’t on your level, yet), or inviting an entire playgroup to build with the same rules, the easiest way to restrict your cardpool is based on the year a card was printed. Most cards list their year of printing at the bottom, and most deck building sites can filter by set easily.
Choosing a year is up to you, but three versions which work well are:
Mercadian Masques and later: Taking away Urza’s Block and earlier removes a lot of the most broken, degenerate cards in the format. There’s lots of goodies in later sets, but they’re usually not as obvious as [Sol Ring], [Demonic Tutor] and [Swords to Plowshares]. The year 2000 was arguably the point at which R&D really started to figure out how to balance magic card design.
Mirrodin or later: This cutoff is easy to identify because of the change in card frame, and rules out another four years with a lot of Commander staples which you sometimes feel you “have to” include.
Modern or Pioneer Commander: One downside to setting your “cutoff” somewhere in the recent past is that other constructed formats often have more impact on card availability. That said, if you’re more familiar with the more recent sets, there’s lots of goodies in the last 5-10 years of magic and building within those constraints can feel really good.
Finally, if you really want to be hardcore, you can take it even further and play Block-Commander. Think of it as Brawl-with-a-Tardis: you can build a commander deck with ANY legendary creature, but all the other cards have to come from a single 24-month period in Magic’s history.
Have you ever built a deck with a year-based restriction? What was it, and how did it work out?