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376.1. Triggered Abilities can usually be recognized by the word "when" followed by a game action or event; the word "at" followed by a point in time during the turn sequence; or the phrase “the [Nth] time” followed by a game action or event. Examples: " When you conquer here, you may spend a buff to draw 1." "At the end of your turn, ready 2 runes." “The first time I move each turn, you may ready something else that's exhausted.”

376.1.a. The phrases that identify triggered abilities do not always appear at the beginning of sentences or abilities.
376.1.b. If an ability triggers “the [Nth] time” something happens and that trigger condition is met multiple times simultaneously, the ability’s controller picks one of those instances to serve as the trigger condition. The ability triggers only once, due to the chosen condition. Example: Wraith of Echoes reads “The first time another friendly unit dies each turn, draw 1.” That ability hasn’t triggered yet this turn. Two other friendly units die simultaneously (say, due to combat damage). The Wraith’s controller chooses one of those deaths to trigger Wraith’s ability.