Lagonna-Band Elder — ruling 1

If you don't control an enchantment when Lagonna-Band Elder enters the battlefield, its ability won't trigger. If it does trigger, but you don't control an enchantment when the ability tries to resolve, you won't gain life.

Lagonna-Band Elder : règles, fonctionnement et interactions (MTG)

Lagonna-Band Elder 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

When this creature enters, if you control an enchantment, you gain 3 life.

How it works : Lagonna-Band Elder

Original English text — Wizards of the Coast / Scryfall

#1September 15, 2013· Wizards of the Coast
If you don't control an enchantment when Lagonna-Band Elder enters the battlefield, its ability won't trigger. If it does trigger, but you don't control an enchantment when the ability tries to resolve, you won't gain life.
No other card is named in this ruling.