I haven't had an issue with the card. I just checked my battle log for Diamond Modern. Out of the 20 battles listed, 6 of them used Nidhoggr.

Out of those 6 Nidhoggr battles, every single one of them was a Win.

Maybe I've just been lucky, but I can understand why @breakingbenjamin says the card is fine. I suppose I don't feel particularly strong either way. As a result, I will likely not vote for or against on this proposal.