First, let me say this: I don’t see this being implemented, but I do like the idea.

How about some of the banned cards are conditional? You can play them as long as you don’t play them in the same deck with another card.

Example: Card not found got the axe for being too good with Card not found, forming an efficient turn four infinite combo, where one part of the combo can be used to find the other and one part of the combo is just very efficient, making the deckbuilding cost of playing the combo very low.

The thing is, Card not found is a mythic face card of a set. It wasn’t going to get banned unless it was a problem in other ways (like Emrakul). So, the poor uncommon cat was pushed out. However, Card not found has a lot more uses in the format. For example, I wanted to play it with a bunch Cartouches and Trials.

That’s just one wild idea. There’s so many strong ETB abilities in the format that I’m pretty sure Card not found would have seen a lot more play than Card not found has since the banning (which is basically none).

So, why not only ban playing Card not found and Card not found in the same deck?

Sure, it’s not quite that simple. You know certain segment of the player base will immediately ask about sideboarding, which is something that would need to be addressed in the rules.

However, more options is always more options. Card not found is a strong card with multiple uses. It is also an uncommon, letting players play something powerful without having to make a huge investment.

However, would it be worth it? It would add complications to the rules and not for much benefit. How many cards like this are there? The Standard banned list looks currently like this:

Besides the cat, all the other cards have been banned, because they are too powerful. They are not used as part of a two card combo, but instead they push certain decks over the top. (You could probably unban Card not found now that the Eldrazi are gone.) Trying to pair any of them into these conditional bans would be quite hard.

In other formats, you run the risk of looking foolish, when a new card comes along and replaces one of the pair. There’s also the problem of having too many options, although Card not found is a lot more fragile than Card not found, but that wouldn’t exactly make Card not found safe (although it too, might actually be safe). Looking at Modern banned list, this approach wouldn’t do much. Maybe allow for Card not found to be banned only conditionally, but would that even matter, as it probably wouldn’t do anything without this particular combo?