Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact with mana value one or less and Workshop Assistant, adding CCCC.
When Workshop Assistant dies, its ability triggers twice, returning Junk Diver and the nontoken artifact with mana one or less to your hand from your graveyard.
Cast Junk Diver and the nontoken artifact by paying at most 4.
Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact and Junk Diver, adding CCCC.
When Junk Diver dies, it triggers twice, returning the nontoken artifact and Workshop Assistant to your hand from your graveyard.
Cast the nontoken artifact and Workshop Assistant by paying at most 4.