For reference, Malthael has a 54.0% win rate and is the 8th highest winning hero in the game.
For reference, Qhira has a 50.5% win rate and is the 47th highest winning hero in the game.
I always have and always will vote for Yogg-Saron. Everyone please make him our next meme so that I can convince my teammates to put him in. 
You’ve felt the tremors of his approach; now prepare for the unmaking of your world as Deathwing descends upon the Nexus. Not content to lay waste to World of Warcraft and Hearthstone, The Worldbreaker has set his sights on the realms of the Nexus to spread his reign of death and destruction.
The Hour of Twilight falls, mortals. Bow before The Destroyer, or burn beneath the shadow of his wings!
As a mighty dragon aspect, Deathwing has the power to switch between two forms in battle: Destroyer form, which grants him access to the Incinerate and Onslaught abilities, and World Breaker form, which allows him to use the Lava Burst and Earth Shatter abilities.
Also, those enormous, powerful wings aren't just for show; if the need arises, Deathwing can soar high into the sky, replenishing his health as he surveys the battlefield from above the carnage. When he's ready to rejoin the action, Deathwing can slam into the ground, dealing damage and assuming one of his two ...
Read moreWe’re adding a new feature to Heroes of the Storm that will allow you to charge into battle with an extra bit of flair: introducing Mastery Rings!
Reaching level 15 with a hero you own will unlock the ability to use gold to purchase a Mastery Ring for that hero, which will be displayed in game as an extra adornment of your hero’s regular selection circle. Additionally, when you reach level 25 with that hero you can then purchase an even more distinct Mastery Ring with gold.
Q: Can I get Mastery Rings for more than one hero?
A: You can get Mastery Rings for as many heroes as you like, given than you’ve reached at least level 15 with those heroes.
Q: Do I purchase these rings for each Hero separately?
A: Yes. These rings signify experience playing individual heroes and let other players know that you know how to play your chosen hero, so Mastery Rings are hero-specific.
Q: When will Mastery Rings become available?
A: Mastery Rings are live now!
Heroes of the Storm has just been updated with Hero balance changes and bug fixes! Read on for details.
“Leaving him On a Good note Ahead of Nipping out some of his kit…”
I think you’re a pretty cool guy 
Thank you everyone in this thread to keep track of this issue. I’ll commit a fix today. Depending on the release and localization schedule, this may not be included in the next client patch.
Thank you for your patience, Zaxter. We’re testing another fix for the scene browser that the purchase dialog is dependent on. If testing goes well, we should be able to deliver this along with the next balance patch. Please keep us updated.