Magic: The Gathering Comprehensive Rules Changes - Masters Edition to Lorwyn

Old rule (Masters Edition)	New rule (Lorwyn)
501.10a. [Click to view all changes.]
	501.10a. To clash, a player reveals the top card of his or her library. That player may then put that card on the bottom of his or her library.

Old rule (Masters Edition)

New rule (Lorwyn)

501.10a.

To clash, a player reveals the top card of his or her library. That player may then put that card on the bottom of his or her library.