If you can rankup VTD otherwise for act5 Venom is very good. I myself use him in UC
Venom all the way. Such an amazing champ, he's great against spideys, great against opponents with buffs, even greater against opponents who can bleed.I use my r4 venom practically everywhere.
You could also rank your 4* corvus - with a handful of revives he's a rather cheap option for your first run against the collector.Although you might want to have him awakened for that for a little more safety.