(I'm assuming the skeletons are just vanilla 1/1's here)
Pretty good card in arena, not worth running in constructed.
The real question is why they printed another broken common arena card for one of the top arena classes.
It's not broken by any means...
It's pretty much a better pit fighter(since it allows you to fill "holes" in your mana curve, similarly to firefly). It may not be "broken" but it's way above average, and given that it's a class common, you can expect to get it on most rogue drafts. I just don't get why they would give this to rogue, and a fucking 5 mana summon 2 1/2's with poison to druid as their class common.
Seems fine. Yeah, the tokens are worse than Flame Elementals, but that's not all that significant for combo purposes. The 5/5 body actually contests the board (and can do so once again with N'Zoth) while generating tokens for Sherazin/Edwin/Questing, whereas Igneous Elemental could largely be ignored by your opponent and rarely made for favorable trades due to how understatted it was.