Because of the way Kroxa and Kunoros' ability resolves, you can sacrifice it in response to the reanimation clause, sacrificing it to the Altar, to mill six cards and then exile five of them to return Kroxa and Kunoros to play, triggering its ability again in an infinite loop
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Infernal Reckoning is by far the best removal spell against them, followed by Unravel the Aether because both ignore Darksteel Citadels indestructibility while answering any of their threats, but any Shatter or Naturalize effect will serve you well, as will Fatal Push or Legions End
Ive submitted rather large bulk submissions twice now and each time the process was super easy and I received my cash payout in about 5 business days
You can buy two Japanese boxes for the price of one English box and get a better opening experience from each
Pyretic Hunter: more for my notes