Waterspout Djinn — ruling 1

You choose a land to return and return it during resolution of the upkeep triggered ability. This means if you have two Waterspout Djinns, they must each return different Islands.

Waterspout Djinn : règles, fonctionnement et interactions (MTG)

Waterspout Djinn 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

Flying At the beginning of your upkeep, sacrifice this creature unless you return an untapped Island you control to its owner's hand.

How it works : Waterspout Djinn

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
You choose a land to return and return it during resolution of the upkeep triggered ability. This means if you have two Waterspout Djinns, they must each return different Islands.
No other card is named in this ruling.