10.3.0
This new version will introduce support for proxies:
A card flagged as proxy will be like any other card but will appear as sepia and will have its price set to 0.
To set / remove the proxy flag, go to the card page and use the ... menu:
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I would never guess that proxies would be approached in UG since they're considered "piracy" as far as I know. Please correct me if I'm wrong. Good idea!