Viper isn't a "carry" any more, don't build him like one. Viper has 2 GREAT things he can do now - laning and ganking. Dominate a lane, then gank like crazy so your team massively out-levels and out-farms the other team. The removal of Frenzy removed his slight ability to late game. Bottle and couple bracers, rack up massive kills, get BoT for better map control, continue to rack up kills. Bottle solves your mana problems to orb walk, the rest is cake. Games go much quicker in this version, even in bad pubs. You should easily dominate the 5 agi carries that the other pub team probably has. Before you know it, game's over and you did well. And if it doesn't, you can start getting some survivability/dps, I'd say heart first, survivability is what Viper lacks most. But regardless, your ganking dominance should put your team way ahead, and you can continue to gank the late gamers as they attempt to farm and push towers.