Card is pushed, but i'm not convinced it's even better than Koth. Yes Koth doesn't directly defend itself, but this chandra doesn't do that nicely either. Most played creature in non-standard have bigger than 4 butts, with delver exception, i guess. Koth gave you much more mana and a much faster clock if you needed them. This chandra seems more of a controllish card, but it doesn't do much on bad board states. Will surely see play in all non-eternal formats.
Also, "fast" red mana being essentially worse thran dynamos is so bad from a flavor standpoint. What about that is "fast" lol. Just give fast mana with restrictions if you're scared of combo accellerants.
EDIT: before people jump on me "it's playable in modern so better than koth" i'm talking about an eternal standpoint. Koth is arguably better in the only Legacy deck that would consider running this chandra, dragon stompy.