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Sure, it’s easy. You take it, play a hand with a bad curve, ignore trades, and on the sixth turn, you play Kari and win. The problem with aggro decks is that if you slow down even a little, it’s hard to finish the game. Kari solves this problem to some extent, but there are still difficulties.
Essential: Vanya, Yurka, Wolf, Claw, Summon Bloodkin, DoD, at least 5-6 1-drops, a low curve, and you used to close out the game with Imp Lancer (sometimes Slow Dominika or Alu). Now, a good aggro deck plays Kari and doesn’t need to put anything above 6 mana.
You can run a lighter version without Kari, closing out the game with Imp Lancer as before. This is good for story mode and daily quests. In that case, you only need 3 Vanyas from gold, and the rest can be obtained from silver and bronze. In general, this deck is very fast and straightforward; you either win or lose.