Nono, forget the part about being also banned in block, because apparently Chrome Mox isn't banned in Mirrodin. I thought it was and so said the whole thing wrong.
Let me restate: We follow the Vintage B/R list. However, if the card is in the current block that's available, we can still play multiples of it (i.e. Chrome Mox).
Not sure if that rule will stay or not because actually, the last couple months I've played, no one's really played with Chrome Moxes.