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Magic: The Gathering Comprehensive Rules Changes

Masters Edition to Lorwyn (Single Change View)

General changes

Old rule (Masters Edition) New rule (Lorwyn)

305.3.

As the main phase begins, any abilities that trigger at the beginning of that main phase go on the stack. (See rule 410, "Handling Triggered Abilities.") Then the active player gets priority and players may play spells and abilities. (This is the only phase in which a player can normally play artifact, creature, enchantment, and sorcery spells, and only the active player may play these spells.)

305.3.

As the main phase begins, any abilities that trigger at the beginning of that main phase go on the stack. (See rule 410, "Handling Triggered Abilities.") Then the active player gets priority and players may play spells and abilities. (This is the only phase in which a player can normally play artifact, creature, enchantment, planeswalker, and sorcery spells, and only the active player may play these spells.)