It's very unfortunate that many cards just don't have any use in RPVE. Most of them are defensive cards, like Razorleaf, Stronghold and the like, but also some very slow units like Battleship. This is mostly because these Units/Buildings are stationary, slow or mostly geared towards defense, while RPVE is all about offense.
To counter this, I suggest adding a new RPVE-Mode where you have to mostly defend youself against waves of enemies, unlocking access to new orbs and generators by defeating boss waves.
I know that this is hardly a priority so short after launch and that it will be a ton of work (map generation, scripting, testing ...), so I don't expect to see anything like this for the next months, but I do think it would be worthwhile to add variety to RPVE in the long run.
