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Overview
Yes — you can use Demonic Consultation to empty your library and then have Jace, Wielder of Mysteries replace a subsequent draw with a win. Demonic Consultation does not itself cause a draw, so emptying your library with it doesn’t immediately make you lose under the draw-from-empty rule ; later, when an effect causes you to draw while your library has no cards, Jace’s replacement ability causes you to win instead of drawing, avoiding the loss . Rulings to note: you name the card when Demonic Consultation resolves , Demonic Consultation only affects its controller , and Jace’s +1 ability won’t resolve (so you won’t draw or win) if its target is illegal when that ability tries to resolve .
Step 1
Cast Demonic Consultation. You name a card when the spell resolves, not when you cast it .
Step 2
When Demonic Consultation resolves it exiles the top six cards of your library, then reveals cards from the top of your library until a card with the chosen name is revealed; if the named card is not in your library, that revealing continues until the library is empty and all those cards are exiled .
Step 3
Because Demonic Consultation’s effect doesn’t make you draw a card, emptying your library this way does not by itself trigger a loss for drawing from an empty library — a loss only happens if you attempt to draw from an empty library since the last SBA check .
Step 4
With your library now empty and Jace, Wielder of Mysteries on the battlefield, cause an effect that would make you draw a card (for example resolve Jace’s +1 ability targeting yourself) while the library is empty; Jace’s replacement ability applies to that draw and causes you to win the game instead of drawing [Jace oracle text] .
Step 5
Ensure the draw-producing ability actually resolves; if the ability’s target is illegal when it tries to resolve (for instance Jace’s +1 if its target is illegal), it won’t resolve and you won’t draw or win .
Step 6
If the draw is replaced by Jace’s ability (you win instead of drawing), no draw attempt occurs and therefore the draw-from-empty loss does not apply .
Resolution
You may cast Demonic Consultation (you name a card when it resolves ) to exile your library (if the named card isn't found) without immediately losing because Demonic Consultation doesn’t cause you to draw and a player only loses for drawing from an empty library if an attempt to draw was made since the last SBA check . After your library is empty, if you cause a draw while you control Jace, Wielder of Mysteries, Jace’s replacement ability makes you win the game instead of attempting to draw, so you win rather than lose . Ensure Jace’s draw (for example Jace’s +1 ability) will actually resolve — it won’t resolve if its target is illegal, in which case you won’t draw or win .
