Enlightened Confidant
Lifelink At the beginning of your end step, if you gained life this turn, surveil 1. If you put a card with mana value less than or equal to the amount of life you gained this turn into your graveyard this way, put that card into your hand.
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Official rulings (2) · Scryfall
Enlightened Confidant's ability checks at the moment it would trigger to see if you gained life this turn. If you didn't, the ability won't trigger at all. Once your end step begins, it's too late to gain life in order to cause this ability to trigger. However, the last part of the ability will check how much life you've gained as the ability resolves, so you could still gain more life while the ability is on the stack to make putting a card into your hand easier.
If a card in your graveyard has an X in its mana cost, X is 0 for the purpose of determining its mana value.