Spreading Algae — ruling 1

This card now has Enchant Swamp, which works exactly like any other Enchant ability. This means it can only be cast targeting a Swamp, and it will be put into its owner's graveyard if the permanent it's attached to ever stops being a Swamp.

Spreading Algae : règles, fonctionnement et interactions (MTG)

Spreading Algae 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 Swamp When enchanted land becomes tapped, destroy it. When this Aura is put into a graveyard from the battlefield, return it to its owner's hand.

How it works : Spreading Algae

Original English text — Wizards of the Coast / Scryfall

#1April 1, 2008· Wizards of the Coast
This card now has Enchant Swamp, which works exactly like any other Enchant ability. This means it can only be cast targeting a Swamp, and it will be put into its owner's graveyard if the permanent it's attached to ever stops being a Swamp.
No other card is named in this ruling.