Unit Card trading system

For years dodgy players have asked for army trading in game, suspect that's mostly from multi cheaters but still it's an interesting possibility if not abused.

Perhaps a Unit Card trading system might shut them all up.

Dev's would ofc determine the best route to success on an idea like this, I would only put forward the idea of a gold cost to the seller and buyer of unit cards that works to the games benefit.

Anyway, is just an idea that might put the ongoing (usually cheaters) unit trading requests to bed. Giving supremacy another way to peel back gold while not offending anyone.