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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

Multiple multiples, in fact

The Ninja card with library ninjutsu stays revealed and isn't put onto the battlefield until the ability resolves or otherwise leaves the stack

Even more detailed information will be available in the Magic Comprehensive Rules