The original purpose of the Simic Combine was to preserve the health of all Ravnican life-forms. Momir Vig wished to fulfill this ancient purpose. However, Vig was dissatisfied with this mundane task and so he also expanded the original premise to improving the biology of all Ravnican life-forms.
To this end, Momir Vig created the Cytoplasts: blue-green globules capable of storing and transferring beneficial genetic information; for example transferring intelligence to a dim-wit, strength to a weakling, et cetera. 
Unfortunately for Vig, the people of Ravnica did not want to be improved or to undergo the surgery required to receive the benefits (except Simic members and people requiring prosthetics), so Vig created a new version of cytoplast that only need to come into contact with a host in order to bond with it. This allowed Vig to improve the people of Ravnica without needing their consent.
Vig allied with Svogthir (who now possessed Savra's body), and together they planned to create and activate Project Kraj to cleanse Ravnica and start over. He was killed by Agrus Kos, while he too possessed Savra's body.
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