Really, the first one.
Whenever Magic involves drawing cards, it’s actually done as individual actions, so when it says to draw 3, it means “draw 1, draw 1, draw 1” in principal. Hence, you have to reveal each of them when Future Sight is in play.
So when Blood Scrivener‘s replacement effect takes place and changes your “draw 1” into “draw 2”, two “draw 1” actually takes place instead of the “draw 2”. So draw 1, check if it’s a miracle; if not, draw another 1. If the second card is a miracle, I’m sorry, because that’s not the first card you’ve drawn this turn.
If the first one IS a miracle, however, you can reveal it so the miracle ability triggers. Then you leave that card revealed while you draw the next card. After you’re done will all the card drawing you were supposed to do, the miracle trigger goes on the stack and can resolve.
It’s simple. Whenever you draw a miracle card, you ask yourself, “Have I already drawn a card before this during this turn?”
Today’s Rules Tip written by Eddie Cheung