If your team needs damage, buy Crippling - If utility, buy Echo Shard If your team needs anti-heal, buy Ricochet + Toxic Silencer is also a great late game option.
This build focuses on a mix of mobility, damage and utility. It's not the highest DPS build out there, but it feels great to play. Feel free to rush some T4 gun items if you want huge damage, such as Crippling Headshot. Follow me on YT @Deathy or Twitch.tv/DeathyDL!