Anything that makes artifact creature tokens is needed, and Servos can fit the bill, especially since Cayth grants fabricate to other cards
Bruse Tarl, Boorish Herder Bruse Tarl, Boorish Herder, aside from the Magic 2011 titans is one of the early creatures to have an effect upon both ETB and attacking, and what an aggressive effect it is
Cast any of those token-generating spells, and Rapid Augmenter gets a huge power boost in the form of +1/+1 counters and becomes unblockable
The differences here are primarily in sideboard construction, as the first list is using stuff like Tormod's Crypt as additional graveyard hate, while the second has some more traditional Wasteland + Strip Mine action for dealing with cards like Tabernacle
This $7.50 reprint also proves powerful in multiple different strategies