For each trade, it would be nice to have a record of when cards were added/removed.

Why this would be useful:

• Additions to large trades are annoying, as 1 card isn't easily recognizable among 30+ others. If this happens more than once, it can become a nightmare to keep track of all the small changes.
• Removed cards are often more annoying (even for smaller trades), since no record of them remains on the trading page. Combing through pages of tradelists to discover which card(s) were removed? No thanks.

Currently, the lack of change history restricts back-and-forth adjustments enough to make trading noticeably less dynamic than it could be - a changelog would foster a more fluid, life-like style of trading.


Notes:

• This would be most useful for active trades; removing it from finished/cancelled trades could be done if storage space is a concern.
• Relative order of card changes would be most important, but showing them alongside chat messages (or using timestamps if they're separate) would be even more useful.