I got 8th place with this deck in the Temporary Alliances event, which had the special rule "all multifaction units cost one less."
I'm certain this was the most busted thing you could be doing in this event, and most games did not feel close at all. I was going to list all the ways this deck benefits from the cost reduction rule, but... just look at it. It's a thing of beauty.
This all began because I wanted to do something silly with Haunting Scream + 4-cost Warband Chieftain, and then realized from the decklist how insane the rest of the list was going to be. I'm particularly proud of adding 4 Treachery, which, besides being generally insane at 1 cost, is an answer to Desert Marshal, the deck's only significant weakness in the event.