Just max out the r1 and use him in act 7. If you feel like you are enjoying him then do it otherwise don't. Personally I feel starky is a very good champ with loads of damage and decent utility.
If this is to get you to be TB, then Stark is definitely worth it.
If you are far from t5cc, then Stark is certainly a worthy candidate, but you might pull someone better in the meantime so I wouldn't stress over it until that time comes.
If you have the t5cc now and are already TB, then it really depends on your needs. Does an r3 Stark address a significant need for you? If not, then I'd wait.
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Personally I feel starky is a very good champ with loads of damage and decent utility.
Are you already TB?
If this is to get you to be TB, then Stark is definitely worth it.
If you are far from t5cc, then Stark is certainly a worthy candidate, but you might pull someone better in the meantime so I wouldn't stress over it until that time comes.
If you have the t5cc now and are already TB, then it really depends on your needs. Does an r3 Stark address a significant need for you? If not, then I'd wait.