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4 star duped venompool

I won him from the latest arena is he worth using on my main team and how much should I upgrade him
5
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It depends on your level, number of champs you have and what you're doing. If you've only got a handful of 4* champs, then anyone is worth having.
He's actually a fairly effective questing champ up to the end of Act 4; and you could certainly justify taking him to 3/30. Beyond that?
If you have Symbiote Supreme or Masacre for synergy (or both), you could probably justify taking him to 4/40.
Not many people would take him any further. He's really not worth spending the Tier 4 Class Catalysts on, unless he gets buffed.
Save your resources and wait for his Shining day~
I loved playing Him back then. He was on my Team clearing ROL as 5* (r3 75)
If U like a Champ that can heal, healblock und give a serious bleed. He is your man.
With masacre even better.