Actually, If you have gold mold, then it will unlock pallete 8, for real its true btw¹ you can only get gold mold on halloween event, btw² you can get gold mold if you made a deck with a ticker that counts of how many did you tapped/castle players sees the deck you made/did you pressed, also³ it needs to be 10,000 taps/views/press so you can get pallete 8 and the gold mold, hope it helps!

Ok