[5] Sundstein became one of the youngest professional Heroes of Newerth player at the early age of 15, playing the role of solo middle back then.

He started by playing random pub games on HoN servers and later on decided to match up with Jascha "NoVa" Markuse and Tal "Fly" Aizik.

[8][9] Due to decreasing activity in the professional Heroes of Newerth scene, N0tail decided to transfer to Fnatic's European Dota 2 team together with Jascha Markuse, Tal Aizik and Adrian Kryeziu on 30 March 2012.

One year later after not winning any premier tournaments and placing 13–14th in The International 2014, N0tail announced that he is leaving Fnatic together with Fly to create Team Secret, inviting Puppey, s4, and Kuroky to join.

Despite a slow start during The International 2018's group stage, OG finished fourth and were seeded into the upper bracket of the main event.

Considered underdogs during their entire time at the event, OG and Sundstein advanced to the grand finals and won the tournament by defeating PSG.LGD in the best-of-five series 3–2.