The special foiling, the lore pips across the card, there's so much making this card beautiful that it's no surprise it's so expensive
Thats a lot of potential card draw for one slot, and its very reminiscent of other effective card draw tools like Deep Analysis
Therefore, if you cast when you have received 4 points of damage and this increases to 5 points before the point of resolution, the total damage dealt to the Forwards will remain 10000
On the other hand, Burning-Tree Emissary has been downgraded to common and should be readily available at $0.50-$1 for at least the next year
As long as neither player is manipulating their library or using their graveyard, using a Millstone does nothing but reveal information until the player being milled runs out of cards, but it took more explanation than you can possibly imagine to make players understand this