2009-10-01 : The 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) causes you to put 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).

2009-10-01 : When 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 that resolves.

2017-11-17 : Lotus Cobra’s ability isn’t a mana ability. Opponents may respond to it before you have that mana.

2020-09-25 : A landfall ability doesn’t trigger if a permanent already on the battlefield becomes a land.

2020-09-25 : 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 puts a land onto the battlefield under your control.

2020-09-25 : Lotus Cobra’s ability uses the stack and players may respond to it. It isn’t a mana ability because the event that causes it to trigger isn’t a mana ability.

2020-09-25 : 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.