+1: Draw a card. Target player puts the top card of their library into their graveyard.
0: Target player puts the top ten cards of their library into their graveyard.
−7: Any number of target players each draw twenty cards.
9/22/2011 If you target yourself with Jace’s first ability, you’ll draw a card first, then put the top card of your library into your graveyard.
9/22/2011 If you activate Jace’s first ability, and the player is an illegal target when the ability tries to resolve, it won’t resolve and none of its effects will happen. You won’t draw a card.
9/22/2011 If Jace’s third ability causes a player to draw more cards than are left in their library, that player loses the game as a state-based action. If this ability causes all players to do this, the game is a draw.