Drake Familiar — ruling 1

The ability lets you return any enchantment on the battlefield, including an opponent’s enchantment. The ability isn’t targeted, so you can return an untargetable enchantment. If there are no enchantments on the battlefield, or you choose not to return one, you must sacrifice Drake Familiar.

Drake Familiar : règles, fonctionnement et interactions (MTG)

Drake Familiar 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 When this creature enters, sacrifice it unless you return an enchantment to its owner's hand.

How it works : Drake Familiar

Original English text — Wizards of the Coast / Scryfall

#1October 1, 2005· Wizards of the Coast
The ability lets you return any enchantment on the battlefield, including an opponent’s enchantment. The ability isn’t targeted, so you can return an untargetable enchantment. If there are no enchantments on the battlefield, or you choose not to return one, you must sacrifice Drake Familiar.
No other card is named in this ruling.