Spellslinger has some beefy threats with Metallurgic Summonings and Torrential Gearhulk
BRINGING IT ALL TOGETHER The BAE provides a lot of setup and value, but there are a few final cards that tie the whole thing together nicely
With other complementary artifact mana sources like Thran Dynamo and Grim Monolith, decks could count on being able to get the kind of mana you'd need to justify packing the cards that would let you use the mana from Metalworker to deliver the knockout blow, and their presence lets you turn that Metalworker mana into permanent giant amounts of mana rather than just a one shot deal
The deck can very quickly overrun your opponents
For example, superfriends decks get to activate their planeswalkers and bring them closer to ulting, a shrine deck gets those juicy upkeep triggers, and so on
The deck is very swingy in nature, but most of those creatures are slow