I decided to try limiting myself to only 3 colors and see where that took me in some different builds. My first attempt was RUG. These are the results:
I only played one practice match vs Dredge (I won). This has a very interesting line in it where you can pitch Anger to grab Lumberjack, play it with haste and eat a Forest for GGG to use 3 more Survival activations (especially good if you cast him off Mox Ruby!) It only nets you 1 G mana (unless you had the Ruby) but it nets you and extra discard which could allow for an extra 4 damage!
I'll add other 3 color experimental versions later on!