We could make fun of the fact that it wasn't templated correctly in order to give it a five-color color identity
The obvious way to win with Molten Duplication is using it to create a massive amount of copies of Dualcaster Mage that all have haste
Counterspells are a great tool in Commander, and including a couple of the juicier ones at least in your decks is a good idea
The best turns involve copying this legendary artifact with Echo Storm or a similar effect, though you'll have to get rid of any copies that still remain, since Ugin's Nexus would make you skip over all your hard-earned turns if you keep a copy in play
Maulfist Squad also has Fabricate 1, letting you chose between Creating a 1/1 Colorless Servo Artifact Creature Token, or putting a +1/+1 counter on Maulfist Squad
This land can provide a colorless mana, which gives it a slight edge over City of Brass