Someone needs to put together a list where the fixing is like 4 or 5 complete cycles of Filter Lands, and that's it.
YEEEEESSSSSSSSS. I have been suggesting this. Someone else do the work though.
Ok, but more seriously, the most interesting thing it lets you do is curve CC into DDX much more reliably. Or C into DD as stated. And it's actually not obvious how to take advantage of this in an interesting way in every color. I think it does make W/x aggro better though. There are a lot of white aggro cards with a heavy white commitment.
I mean check out this white section. http://www.cubetutor.com/viewcurve/43329 I think a lot of these cards are more reliably castable with a metric shitton of filter lands.
Having way more trouble figuring out the other sections though.