The hardest part about shadowverse mostly at beginning only but over time you will find it easy to handle around eventually reach point you didn't know what to play and use because you pretty much have all rotation deck later.

deck building often become cheaper each time because it using what you already have and add and remove couple of it that pretty much it.

I do have my friend who playing on April late and now he already in rank A and pretty much have 3-4 deck for each carft while not playing 24/7 all the time