If you gain an amount of life "for each" of something, that life is gained as one event and Enduring Tenacity's first ability triggers only once
Neither does the top-end threat Aladdin Heroic Outlaw now that other options have come along
Emerald cards like the Mad Hatter Gracious Host Quest for three lore and need to be dealt with but if your opponent Challenges him, you get to draw a card
Ajani, Strength of the Pride is one of the better Ajani planeswalker cards, and a fantastic top-end piece for decks that plan to gain a bunch of life
And in case you forgot, we typically get seven versions of every Standard rare / mythic as a baseline: a regular and a foil printing from boosters, an extended art and an extended art foil from Collector Boosters, a timestamped prerelease promo in foil, and a foil and a non-foil planeswalker stamped version from the Promo Packs