This was a fun exercise in deckbuilding for Severin with Sunyveil, but I happened to win a whole bunch with it, so I tweaked and tuned. Turns out Severin is okay, but the rest of the deck was a blast.
Porcelain Mask is fine on its own. Shepherd's Horn is not, so we relegated the only copy to the market, so that we could play 8 Merchants to get rid of extra power that you might draw with Lethrai Courtier. I feel like we run out of things to get in the market sometimes, maybe we only want like 6-7 merchants? idk.
Once you have the Mask + Horn combo up, Katra and Rat Cage get bonkers.
If you see your opponent has a Red Market, go get your Dissociate and always leave up 2 power so you can stop their Bore. Otherwise you straight up lose to that card.