I'd say it's a pretty good bet that this game will continue to grow. Some are expecting Chaos Legion, the new set, to sell out very quickly. If so, that will just increase the hype and FOMO even more, pushing all prices even higher. Maybe sell a few of the Untamed packs if you want to diversify the money a little and spread it elsewhere, but also hold on to most of them.

My two cents anyway. I could be wrong.