Even if youre never planning to sell your collection, the fact that you can sell it matters a lot
Think about it this way: if youre wanting to see at least one copy of that card each game, you need to put four of them in
Black Cat does so in a way that basically invalidates the need for Gonti at all
I'm talking about all the fancy alternate art, borderless, fractured foil kind of cards
By combining Anowon with cards like Tinybones, the Pickpocket, you can also use the excess cards in your opponents' graveyard to steal their most powerful spells
If a static ability generates a replacement effect which causes a delayed triggered ability to be created, the source of that delayed triggered ability is the object with that static ability