Why not? 1) You can add the craft of the final weapon, which would be created from a large number of things from all over the game and would be at the level (or almost at the level) with ancient artifacts, not only in terms of stats, but also in extremely powerful special abilities (you know how to do cool things and these items should be the COOLEST). 2)The ability to at least slightly use ancient artifacts (if this does not break the lore of the game) that will feel like artifacts, and not ordinary items. 3)You can add a separate class of passive skills for collectors. Other players have asked for an increase in the chance of getting cards and you can add such a skill to the game. Along with this, you can add such skills as: Increased drop of money from enemies Increased item drop Increased damage to enemies that you have a card etc.