Note: There is no "Premium" or "Paid" version of the game that unlocks everything instantly. All gameplay content must be unlocked through progression.
It is tempting to want every card and relic available immediately. However, the progressive unlock system is actually a tutorial in disguise.
If you had access to all 700+ cards and 200+ relics immediately, the RNG pool would be diluted. You would find powerful combos rarely, and you would likely die to complex mechanics you haven't learned yet. By unlocking items slowly, the game introduces mechanics to you one by one.