The Obligatory Type I Darksteel Review
Furnace Dragon
Call me crazy, but I really like the idea of running this in the sideboard of TnT for use against other Workshop decks. My reasoning is that it isn’t very expensive because of affinity, and because its ability makes it completely impossible for them to try to play around it with Goblin Welder to keep permanents they like in play. Of course, I’m probably horribly wrong here, since they’re probably better off just running Artifact Mutation or whatever, but this does only take up one sideboard slot.