So, hear me out: If you have both of these on the table, each time you deal combat damage to a player, that damage gets copied to other opponents as well by Kediss. But Breeches doesn’t require combat damage, any damage is enough. Also, Kediss states that the original source is also the source of the new damage. So, you can get three cards exiled in a three player game. Not that you can count that as three card advantage, since there is no way you can play all of them, but it will give you plenty of options.
EDH Deck Time: Breeches and Kediss