[Feature request] Track Gatcha Cards That Are Already Acquired

[putty174]

As a F2P card collector, I want to know which cards in a gatcha I already have. This way I can maximize the number of new cards I pull when I finally do decide to spend my crystals.

This could be a feature that only works while logged in with an account, but the idea is the same.
On each gatcha page, when you press the "Show" button to see which gatcha cards are available for each rarity, the ones you already have can be grayed out.
In addition, at the top of this popup window, there can be a counter XX/YY unacquired cards, and another counter that shows the rate of getting a new card (the sum of each unacquired card's rate)