Furnace Dragon

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)
Flying
When Furnace Dragon enters, if you cast it from your hand, exile all artifacts.

World Championship Decks 2004

Darksteel

Affinity for artifacts (This spell costs {1} less to play for each artifact you control.)
Flying
When Furnace Dragon comes into play, if you played it from your hand, remove all artifacts from the game.

If a creature (such as Clone) enters the battlefield as a copy of this creature, the copy’s “enters-the-battlefield” ability will still trigger as long as you cast that creature spell from your hand.