Historical Rules · 1 October 2009
Rule 702.12b
Official source text from the 1 October 2009 Rules release
Landwalk is an evasion ability. A creature with landwalk is unblockable as long as the defending player controls at least one land with the specified subtype (as in "islandwalk"), with the specified supertype (as in "legendary landwalk"), without the specified supertype (as in "nonbasic landwalk"), or with both the specified supertype and the specified subtype (as in "snow swampwalk"). (See rule 509, "Declare Blockers Step.")