For a proliferate deck, I'd try to get more guys that are good with proliferate and more big mana artifacts to ensure you can reliably cast your dude for 10+ and go crazy on people:
CUTS:
Orim, Samite Healer (weak card is weak)
Magus of the Disk (you have an excess of sweepers, and this is probably the weakest of the lot)
All is Dust (I have some other sweepers in mind, too)
False Prophet (see other sweepers, below)
Lightmine Field (doesn't do enough)
Rule of Law (not sure its needed)
you will probably make better use of his effect if you make lots of little guys big than a couple big guys bigger. for each extra creature you have, his tap ability will give you an extra +1/+1.
My only real suggestion is to throw Rout in here, as well as Mass Calcify. It's really more about the instant speedy-ness of Rout that makes it so incredible.
CUTS:
Orim, Samite Healer (weak card is weak)
Magus of the Disk (you have an excess of sweepers, and this is probably the weakest of the lot)
All is Dust (I have some other sweepers in mind, too)
False Prophet (see other sweepers, below)
Lightmine Field (doesn't do enough)
Rule of Law (not sure its needed)
ADD:
+1 new sweeper, either Hour of Reckoning, Mass Calcify, or Catastrophe.
+1 Everflowing Chalice
+1 Thran Dynamo
+1 Lux Cannon (for the lulz)
+1 Transcendent Master
+1 Karn Liberated
Magistrate's Scepter and Titan Forge are also really funny, but Cannon is probably more practical. You could also run Kyren Toy or Gilded Lotus in that spot, for MOAR mana.
Hope that helps!
RCRDaretti: Superfriends Forever RCR
WGBDoran: Ent-mootWBG
GGGMultani: Group Bear HugGGG
GB(B/G)The Gitrog Monster: Dredgefall DurdleGB(B/G)
RGWGahiji, the Honored Group Hug MonsterRGW
UB(U/B)Yuriko, Ninja Trinket AggroUB(U/B)
WUBRGAtogatog: Assembling a OHKOWUBRG
WBG Karador, Ghost Chieftain
http://forums.mtgsalvation.com/showthread.php?t=519290