When you are commenting on someones Blog make the comment relevant to the topic, don't push or force your link down their throats.
"Dude #3 Was honestly one of my favorite games ever, I still play that game today! Awesome post!
My Channel - http://bit.ly/19pdPtm"
Now understand you can do this without being spam, there just has to be some honesty in your post and not a bunch of gibberish and a link.
Never expect a million clicks of of these kinds of comments, but remember now your link is out there and you have the possibility of gaining one more view or subscriber.
I have done tons of small things like this to help grow my channel, some I would never admit to [commenting on bigger channels] and some that were successful. Understand not everyone sees things the same and some tactics may work for some and be viewed down upon by others. Maybe this one will work for you or maybe it won't.
Good luck guys and remember to leave some feedback!