Some of this is in the volume of mechanics we include and some of this is about the choice of mechanics
If you instead want to build a cube based around a particular theme or strategy, here are some ideas to get you started
Ghostly Dancers also creates a 3/1 Flying token spirit whenever a Room is unlocked or an Enchantment enters the battlefield, allowing you to defend with the Spirit while having your tokens apply pressure each turn
Personally I think it makes for more interesting strategy, but if the aim is to carve out a competing slice of the online CCG space, the complexity this adds may still prove to be an obstacle
Inner sleeves should fit snugly, but too much pressure on card edges and corners leads to wear over time
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