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
It is important to keep in mind that dot patterns will vary from set to set
How fast does it work
Entering the battlefield lets you fetch up to two cards with mana value 1 or less, which can be creatures, artifacts, or enchantments
Not only does it grant the new freerunning ability to assassins in your hand, its second ability to pay to insta-kill an opponent is very good
After letting the world know that I was writing this article on Twitter, I received multiple reports of these fakes being sold at local stores in three different countries, including the US