Ancient Greenwarden

If a land entering the battlefield at the same time as Ancient Greenwarden (including Ancient Greenwarden itself if an effect causes it to be a land) causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Ancient Greenwarden's third ability affects a land's own enters-the-battlefield triggered abilities as well as other triggered abilities that trigger when that land enters the battlefield, such as landfall abilities. Such triggered abilities start with "when" or "whenever."

Look at each permanent as it exists on the battlefield, taking into account continuous effects, to determine whether any triggered abilities will trigger multiple times. For example, if you control Ashaya, Soul of the Wild, a nontoken creature entering the battlefield will cause any appropriate abilities to trigger an additional time.