Furnace Dragon
Creature — Dragon
Affinity for artifacts (This spell costs 
less to cast for each artifact you control.)
Flying
When this creature enters, if you cast it from your hand, exile all artifacts.
Matthew D. Wilson
Darksteel (DST)
• #62Rulings
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.
(wotc • 2013-09-20)
Rulings
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.
(wotc • 2013-09-20)