1 Apr 2008
You put the revealed nonland cards on the bottom of your library before you clash.
1 Apr 2008
If the spell is countered or doesn't resolve for any reason (for example, if all its targets become illegal), none of its effects happen. There is no clash, and the spell card won't be returned to your hand.
1 Apr 2008
If you have only nonland cards in your library, you reveal your entire library (one card at a time), rearrange it however you like, and then clash.
1 Apr 2008
If you win the clash, the spell moves from the stack to your hand as part of its resolution. It never hits the graveyard. If you don't win the clash, the spell is put into the graveyard from the stack as normal.