spjspj: The colour restriction is done from the EDH Power Level set when you startup the table. Anything mod 6 will restrict white (so 96,86,76,66, 56..) Anything mod 4 will restrict blue (94,84,74..), 3 = black (93,83,73), 2=Red, 1 = G
Does this mean it's impossible to implement a maximum deck power WITHOUT outright banning atleast one color (usually green or red)? Because if that's the case, then that's terrible a terrible implementation. If people want to have fair games with just.. No eldrazi turn two rushes, or exploiting some infinite recursion of some kind, that's one thing. But deck color bans should be decoupled from the power level.
That is of course unless that's NOT how it works, because there seems to be absolutely no documentation of its function whatsoever.