Yes you can, but I can't assure your the stability and time response connection of the game you're playing.
if you can a get a stable signal i believe you can do so, but once nawala yun signal u might experience some lag or worse u might get disconnected, In my exeperience its better to get a Home Broadband instead if you really want to experience dota 2.
If you have a globe tattoo stick, you sure are able to perform any activities in the internet and there should be no problem. However, your connection is signal dependent, so if the area has good and stable signal, you should not have a problem. However if the signal is either good or stable, you might encounter issues with the game and from the thought of it, it might not let you enjoy what you are doing.
Please bear in mind that if you are using the Supersurf 999 either prepaid and/or postpaid, it is subject to Fair Use Policy and if you have reached the FUP, you may not be able to fully use the service like how it was before you have reached FUP.
But, you sure still are getting service.
I hope this helps and best regards!
make sure you have a good signal in your place