I was gonna post a guide on obtaining the ghost skins on YouTube, but it was too long in the works and there is basically no point to release it now.
I'll post an excerpt from it though, which talks about Castleween a little. This thread seems to be more suitable than the Clip one. 🙃
Fair disclaimer that I had a streak of games where Castleween wasn't picked during the map pick. Having played yesterday, I saw the complete opposite, so it isn't that bad. The amount of negative feedback regarding the map on Discord is a bit concerning though.