Since this is no longer an orb, get this if you are not farming too well. You can build this item from scraps. This gives a little of everything you need. Strength for tanking, Movement speed for chasing and running, Attack speed and damage, and Miam. Not suited for most games though as there are many better items for Viper.
Get this if you are farming too well and got a Crystalys mid game. Increases your Dps by a massive amount and gives you neat little red flying numbers.
A Better upgrade to yasha than a S&Y. Even if it was nerfed for ranged heroes, Manta style is still a tempting choice. Gives much needed stats and illusions to create confusion and also to increase your damage output.
The best item for agility heroes. Gives your neat evasion increasing your EHP, Attack speed and Damage. A must on viper in all games.
Gives you massive amounts of damage. Get this if the opponent carry is a Mortred or a carry with a butterfly.
Great Armor and Attack speed bonus. Coupled with a Damage item turns viper into a fearsome foe.
If you are getting nuked to death or need to tank a little, get this item. Gives good passive regen even if it is nerfed and huge amounts of HP.
A Definite choice on a ganking and chasing Viper. Drops the cooldown of your ulti to 12 seconds making it very spammable. It also increases the cast range and decreases the mana cost of your ulti. This item also provides good stats, HP and mana.
Synergy with a chasing Viper. The Silence is useful. This item is also great to use on enemy tanks because if amplifies your huge Dps by 20% as well. The attack speed is also a good addition.
An interesting item on Viper that you should consider. If gives you one of the best disables in the game along with massive mana regeneration allowing you to auto-cast your orb and keep it that way. Get this if you have a good farm and there is a better carry in your team.