Feature Request: Add Numbers of Card in Trading Opportunities

Hi

When opening the Trading Opportunities page, it would be useful to show the amount of cards that sums up the Can Give/Receive value.
This will help users to prioritize larger trades vs smaller trades, and will likely help people who are concerned about trading up/down.

I spend a lot of time opening the trade and closing the trade checking if the amount of cards because shipping is very expensive for me, so I has to be worth it.

This could be an example of the suggestion:

The CSS for those elements:

color: #AAA;
font-weight: bold;

/ swordfischer