Magic: The Gathering Comprehensive Rules Changes - Coldsnap to Time Spiral

Old rule (Coldsnap)	New rule (Time Spiral)
420.5g. [Click to view all changes.]
420.5g. A player who was required to draw more cards than were in his or her library since the last time state-based effects were checked loses the game.	420.5g. A player who attempted to draw a card from an empty library since the last time state-based effects were checked loses the game.

Old rule (Coldsnap)

New rule (Time Spiral)

420.5g.

A player who was required to draw more cards than were in his or her library since the last time state-based effects were checked loses the game.

420.5g.

A player who attempted to draw a card from an empty library since the last time state-based effects were checked loses the game.