Landfall

Landfall is an ability word which signals triggered abilities that respond to a Land entering the Battlefield under the control of the player with the Landfall card.

Description
The landfall ability word rewards a player each time a land enters the battlefield under their control.

Landfall was introduced in Zendikar,   and expanded upon in Worldwake , the Battle for Zendikar block and Zendikar Rising.

Because an ability word doesn't have inherent rules meaning, it can be left off, removed or added at will, without changing the mechanic.

Landfall cards without the ability word
There were several cards printed with the mechanic but without the ability word.

Post-Zendikar


Reprinted in Zendikar Rising with the ability word.

Rulings

 * A landfall ability triggers whenever a land enters the battlefield under your control for any reason. It triggers whenever you play a land, as well as whenever a spell or ability (such as Rampant Growth) puts a land onto the battlefield under your control. It will even trigger when a spell or ability causes another player to put a land onto the battlefield under your control (as can happen with Yavimaya Dryad's ability, for example).
 * A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.
 * Whenever a land enters the battlefield under your control, each landfall ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve.