Person to person trades are a little glitchy because you cant see another persons haves most of the time, so Id ignore it unless you have another friend you know is online and want to send cards to them as they send cards to you
For example, if you attack with a 5/5 Giant with trample and it's blocked by a 2/2 creature, you can assign 2 damage to the blocker and 3 damage to the defending player
If you dont need the money and the space isnt an issue, holding them for five or six years is almost always going to provide the best chance of a great return with almost no risk of losing your shirtas I said earlier, even boxes from bad sets are still fairly valuable
Whatever your need, we've got you covered
And once you have Delirium, Unholy Heat is just ridiculously strong, punishing opponents for playing any top end cards that dont immediately impact the game