While the value of an item is ultimately determined by the condition it is in, even a graded PSA 9 has fetched for over $1,000
In an EDH game with three opponents, you won't have any trouble finding someone to attack
Decks will be Standard format size
This is a great way to play Pokemon with those friends you met online through the forums or if you don't have time to meet up with friends in person you can play over PTCGO
After your second main phase, you then get an ending phase normally this will simply pass the turn, but it could include any card that triggers at that time, discarding down to the maximum hand size, that kind of thing
The new theory presented by @pokemonrevolution suggests sheets are stacked on top of each other before the 1st edition stamp ink was dry, causing both the imprints at the back of the cards, as well as the Grey stamps