I spend most of my gems on Crimson Kingdom and this deck and I love this archetype over everything. I do recommend getting UR and Neo for good support cards. Even Valkyrie is good, but only thing needed was Soul Exchange. Overall, the pack is good. Depends on how you play and if you want to do something outside of the traditional crap in PVP.
It really worth if you pretend to use the combos, or set with decks like HHG, parasite, and is a mini pack, you won't be dwelling as much to get SR and UR