Here's my deck idea for the upcoming event based on a couple of ideas. The central one is scream aggro and recursion - hopefully it works!
Rindra's Choice: a 1 cost slay/unseal for the purposes of this event. Not to say there won't be single faction cards, but I imagine there will be less than normal. Broken.
Haunting Scream: Can now bring back Champion of Cunning, or perhaps even Cirso if you choose to include him.
Twilight Raptor: 0 cost 2/2/ flyer - sounds pretty awesome to me.
Auralian Cargo - a 0 cost seek power for this event. Broken.
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Things I'm unsure of: Do I need trail maker (or do I need more of him? Am I going too far out of the way to have almost all multi-faction cards? Should I have dark return/mirror image in main deck (for screaming purposes)? Should I have had Vara's choice in here?
Anyway, this is my idea for the event. Comments are welcome and appreciated, especially before the event. Feel free to use this or any part of this, so long as you have fun with it.
Also with lower costs crests could be even more useful since you don't have to worry as much about having ready power in the early turns (since everything is cheaper.) In general the market looks like it needs work. But nice job overall on the deck idea.