If you gain an amount of life “for each” of something, that life is gained as one event and the ability will trigger only once.
Cleric of Life's Bond
An ability that triggers “whenever you gain life” triggers just once for each life-gaining event, no matter how much life you gain.
An ability that triggers whenever you gain life “for the first time each turn” won’t trigger if you gain life during a turn before the permanent with that ability is on the battlefield, even if you gain life again later in the turn.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Andrey Kuzinskiy
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