Magic: The Gathering Comprehensive Rules Changes - Ravnica: City of Guilds to Guildpact

Old rule (Ravnica: City of Guilds)	New rule (Guildpact)
Artifact [Click to view all changes.]
Artifact Artifact is a type. The active player can play artifacts only during his or her main phase when the stack is empty. When an artifact spell resolves, its controller puts it into play under his or her control. See rule 212.2, "Artifacts."	Artifact Artifact is a type. The active player may play artifacts during his or her main phase when the stack is empty. When an artifact spell resolves, its controller puts it into play under his or her control. See rule 212.2, "Artifacts."

Old rule (Ravnica: City of Guilds)

New rule (Guildpact)

Artifact

Artifact is a type. The active player can play artifacts only during his or her main phase when the stack is empty. When an artifact spell resolves, its controller puts it into play under his or her control. See rule 212.2, "Artifacts."

Artifact

Artifact is a type. The active player may play artifacts during his or her main phase when the stack is empty. When an artifact spell resolves, its controller puts it into play under his or her control. See rule 212.2, "Artifacts."