He's gorgeous! I've been trying to get a Deneb forever, but I can never access his parts of the MA website and I can never find him for purchase. Is he super special or something? T-T. My heart burns with envy. T-T.
Soom has a "Four Five Days" section here [link] And that's from the 15th till the 19th of each month, and some of the dolls in that section might be released in those 4-5 days. The dolls released in those days change every month. So you can't get the same doll every month.
So Deneb might be available again the 15th/19th next month but SOOM releases their "4/5 days" release list every month, so more info there.