There aren't many Expansion colors left...
We're running out of colors for Expansion Packs... that's why there won't be many anymore. https://i.imgur.com/7DtfMXt_d.jpg?maxwidth=640&shape=thumb&fidelity=medium The only colors left are ...
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There are over 10 million colors visible to the human eye to choose from. I'm sure they could figure something out if they needed to.
