If you do not implement the actual rules, then it can probably be made to support many other kind of card games too.
However, I would be interested to have a FOSS rule engine of Magic: the Gathering, preferably written in C, and licensed by AGPL3 or some compatible license. But, unfortunately there is no official FOSS implementation; if there was (at least of the rule engine; not necessarily the UI) (especially if literate programming is used for the rule engine), I think that it would be better since the rules can be made more precise.
I would want to ensure that the rule engine has no pictures at all (you can easily download pictures separately if you want them, anyways; so the rule engine doesn't need them and shouldn't have them).
However, I would be interested to have a FOSS rule engine of Magic: the Gathering, preferably written in C, and licensed by AGPL3 or some compatible license. But, unfortunately there is no official FOSS implementation; if there was (at least of the rule engine; not necessarily the UI) (especially if literate programming is used for the rule engine), I think that it would be better since the rules can be made more precise.
I would want to ensure that the rule engine has no pictures at all (you can easily download pictures separately if you want them, anyways; so the rule engine doesn't need them and shouldn't have them).