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i mean tell me if im wrong but, you dont need to have the mana available prior to casting using his ability. example in the post on wizards form.

https://feedback.wizards.com/forums/918667-mtg-arena-bugs-product-suggestions/suggestions/48530546-k-rrik-not-working

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14 days ago - /u/WotC_Jay - Direct link

Thanks for the report! There's currently a bug you can run into with K'rrik when you control only black sources, and it sounds like that's what you hit. We're working on a fix, and hope to have it released soon