Magic: The Gathering Comprehensive Rules Changes - Core Set - Ninth Edition to Ravnica: City of Guilds

Old rule (Core Set - Ninth Edition)	New rule (Ravnica: City of Guilds)
212.6e. [Click to view all changes.]
212.6e. If an effect changes a land's type to one or more of the basic land types, the land no longer has its old land type. It loses any rules text it had in its text box, and it gains the rules text for the appropriate mana ability for each of its basic land types. Note that this doesn't remove any abilities that were granted to the land by other effects. Changing a land's type doesn't add or remove any types (such as creature) or supertypes (such as basic, legendary, and snow-covered) the land may have. If a land gains one or more land types in addition to its own, it keeps its land types and rules text, and it gains the new land types and mana abilities.	212.6e. If an effect changes a land's type to one or more of the basic land types, the land no longer has its old land type. It loses all abilities generated from its rules text and its old land types, and it gains the appropriate mana ability for each new basic land type. Note that this doesn't remove any abilities that were granted to the land by other effects. Changing a land's type doesn't add or remove any types (such as creature) or supertypes (such as basic, legendary, and snow-covered) the land may have. If a land gains one or more land types in addition to its own, it keeps its land types and rules text, and it gains the new land types and mana abilities.

Old rule (Core Set - Ninth Edition)

New rule (Ravnica: City of Guilds)

212.6e.

If an effect changes a land's type to one or more of the basic land types, the land no longer has its old land type. It loses any rules text it had in its text box, and it gains the rules text for the appropriate mana ability for each of its basic land types. Note that this doesn't remove any abilities that were granted to the land by other effects. Changing a land's type doesn't add or remove any types (such as creature) or supertypes (such as basic, legendary, and snow-covered) the land may have. If a land gains one or more land types in addition to its own, it keeps its land types and rules text, and it gains the new land types and mana abilities.

212.6e.

If an effect changes a land's type to one or more of the basic land types, the land no longer has its old land type. It loses all abilities generated from its rules text and its old land types, and it gains the appropriate mana ability for each new basic land type. Note that this doesn't remove any abilities that were granted to the land by other effects. Changing a land's type doesn't add or remove any types (such as creature) or supertypes (such as basic, legendary, and snow-covered) the land may have. If a land gains one or more land types in addition to its own, it keeps its land types and rules text, and it gains the new land types and mana abilities.