Aspect of Lamprey — ruling 1

If the creature Aspect of Lamprey would enchant is an illegal target by the time the Aura spell resolves, the entire spell doesn't resolve. It won't enter the battlefield, so its ability won't trigger.

Aspect of Lamprey — ruling 2

Multiple instances of lifelink on the same creature are redundant.

Aspect of Lamprey : règles, fonctionnement et interactions (MTG)

Aspect of Lamprey is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Enchant creature you control When this Aura enters, target opponent discards two cards. Enchanted creature has lifelink.

How it works : Aspect of Lamprey

Original English text — Wizards of the Coast / Scryfall

#1January 24, 2020· Wizards of the Coast
If the creature Aspect of Lamprey would enchant is an illegal target by the time the Aura spell resolves, the entire spell doesn't resolve. It won't enter the battlefield, so its ability won't trigger.
No other card is named in this ruling.
#2January 24, 2020· Wizards of the Coast
Multiple instances of lifelink on the same creature are redundant.
No other card is named in this ruling.