It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on
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Having tracking information and insurance will ensure that you will be taken care of, no matter what happens
It is very hard to beat a resolved Ad Nauseum in Commander
If Ephara is the breakout card at a Grand Prix or Pro Tour soon, she will double in price, and you should buy in once the decklists start hitting the net
If you discard a land card this way, put it from your graveyard onto the battlefield tapped