Feather, because it is surprisingly speedy and light on its feet for a deck with no tutoring and expensive breakers. Boa, because it will slowly asphyxiate and swallow the Corporation whole, much like a Boa Constrictor would a baby goat.*
The premise here is simple, combine Prepaid VoicePAD economy with both Data Folding and Underworld Contact to create a late game powerhouse runner while using The Source and Fall Guy to lock up the Corp and create that late game situation. At that point your unassailable economic advantage, coupled with Globalsec Security Clearance, will eventually end the game.
In nearly every situation you're going to mulligan for draw power. A full third of the deck is high powered economy cards, so finding both quick money and sustainable economy will not be a problem. Your draw power - Quality Time and Earthrise Hotel - will be made hyper efficient by Prepaid VoicePAD and Career Fair respectively, and bring your breaker suite together quickly enough to challenge the scoring remote of a corporation slowed down by The Source either before the agenda count gets out of hand.
Advance-able traps are a threat, since they can bluff around The Source, but in the mid-game your inexpensive draw power and redundant copies of breakers should pull you through. In the late-game you will be using Globalsec Security Clearance to snipe advanceable traps in R&D along with Feedback Filter to help deal with those that slip through the net.
The primary issue with this deck is that games take a long time to play, likely rendering it unplayable in a tournament situation.
*You might want to think twice about searching for that Boa Constrictor/Goat thing.