If Obara Sand is in your hand after your first mulligan, before you place any setup cards you may remove her from the game and take an additional mulligan.
1. If Obara Sand is in my hand after my SECOND mulligan, would that mulligan qualify for the ability, as it is indeed also after the first mulligan?
2. What happens when I have more than one copy of Obara? How are they removed from the game? What happens if I have more than one copy of Obara in my hand?