It was only when alternate mana acceleration like Mana Vault got taken away that players finally noticed how good Metalworker was and started tuning their decks with Metalworker in mind
Even if you play it against midrange and control decks, you will be able to mill tons of their lands, and at times even all of them, before they can do anything significant
Youre not likely casting too many ten mana spells over the course of the game, so youll probably be getting more mileage out of creating the Elementals, which is still well worth it
Empty your deck with Leveler, then your extra turn spell will go right back to the top of your deck on use
Does Wish Cards Work on Exiled Cards
Goro-Goro, Disciple of Ryusei and Satoru Umezawa, from Kamigawa: Neon Dynasty