Although the token is attacking, it was never declared as an attacking creature
Then, and this is the main thing, Whenever Kroxa enters the battlefield or attacks, each opponent discards a card, then each opponent who didnt discard a nonland card this way loses 3 life. Kroxa is a bit odd, but theyre an all-rounder for discard decks
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Brad Watson defeated Raphael Ait-sliman in the final round