The Idea is to use Crystology to more consistently get Immortal Prelates and Primalfin Champions and use Call To Arms to get your Immortal Prelates out of your deck again in the mid to late game. This deck also has a lot of heal that helps keep your hero alive until you can play bigger threats in the late game along with your endless army of Immortal Prelates. No deck will have enough silence to take down all your threats.
Note: Most of the legendaries are in the deck to have big threats that synergies with your deck in the late game. They can be easily replaced with other big threats in your collection. I’d say the most important legendary is Kangor so he can keep you alive where you can play the rest of your big threats.