Knowing is half the battle – at least that’s what GI Joe recommends. With trading card games, this statement definitely holds true. You need to know every detail about the card you want to trade. The more you know, the better the odds of making a good deal – and that’s the goal.
Desolate
It's also good to find
It's also good to find trading partners who's skills slightly differ from your own.
For example if you're specialized in using Hand 2 Hand combat, it might be worth to find some Handheld specialists and trade their Hand 2 Hand cards for your Handheld ones.
Same goes for Block and Evasion. I doubt someone will max out every skill from each category, at least at this point of the game.