[MunchkinMan]

The one rules snippet I quoted says that you can't trade while you're in combat, and then trading is only limited to Items you have in play. I.e., you can't trade cards from your hand, regardless of what they are. You could ask a player to play a specific card for some kind of reward from you, but it has to be something you can legally do, like play a GUAL on the player, or trade him an Item from those you have in play when you are not in combat. You can't give a player a Level from the combat, or cards from your hand, normally, so these are not rewards you could offer.

Now, an important thing to note is that while any player is in combat, no one can trade with him, but the players not in combat may trade with each other.