Mini-review as per
Skill 1 - I like the use of the volcano visual, its too fucking hot to ignore.
Fine dps skill here.
Skill 2 - Is this like an immolation? I'm not quite sure with the forced synergy with the 1st skill.
Skill 3 - I like how you get more damage when erupts in the area/volcanic pit. But seems quite forced too. Another summon skill, but it does seem more than sub-par which pretty much is satisfying. Good skill.
Ultimate - Makes use (too much use) of the first skill. Another DPS skill which I thinks makes this hero repetitive.
Overall I think Ragnaros has a limited initiating capability. All his skills surround the use of using the 1st skill to start with everything. Without skill 1, you can't do anything effective. That's where the conflict revolves. Although I love the theme and concept but not quite the ultimate at the moment, that needs a bit of improvement. PM me if you have any concerns or need any more help. I'll be sending some more of the requests, but all at once I'll compile it. Good luck.