So Yahoo chess used to allow you to customize rooms for like minded players. You could set time, rank, which color you would play, etc... My idea is to make a new mode with random match making, but people only match to the same settings. 3 basic conditions. 1 faction restrictions, 2 time restrictions (for those looking for a faster game,) and 3 provision restrictions. You can set a room to only allow x number of provisions, and any cards played beyond x are banished. For example, you set the room to 99. You can bring whatever deck you want, but once you played 95, any card above a 4 gets banned. You could set a series of contracts based on this. Ultra low provisions or ultra high provisions could make for an interesting mode.
