Covetous Dragon | Magic: The Gathering
Formats Covetous Dragon is Legal in
Official Oracle Text for Covetous Dragon
When you control no artifacts, sacrifice Covetous Dragon.
Official Rulings for Covetous Dragon
10/4/2004 : The ability only checks if you control no artifacts at the time it triggers. It does not check again on resolution. So gaining control of an artifact before then will not save the Dragon.