Goblin Spymaster Forcing your opponents to make undesirable attacks on each other is a tried-and-true tactic in the political world of EDH
Players may include duplicate cards, as long as every card coincides with the chosen color identity of the commander(s)
Cursed Scroll was so warping, even slow midrange/control decks would frequently make use of the card, since it was so much better than anything else you could be doing, even if it didnt really match your strategy
Hostile Negotiations is the one Im hot on right now though it can be a draw six for a deck that can take advantage of it
If a creature enters the battlefield as a copy of a face-down creature (or if a token is created that's a copy of one), that copy has the same characteristics as the face-down creature (in this case, it's a 3/3 creature with the two abilities and no other characteristics), even though the copy is face up
After all, it would be a crying shame to have all your massive threats chump blocked