Gandalf the White + Workshop Assistant + Myr Retriever + Krark-Clan Ironworks

Gandalf the White

Workshop Assistant

Myr Retriever

Krark-Clan Ironworks

How it works

1. Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact with mana value one or less and Myr Retriever, adding CCCC.
2. When Myr Retriever dies, its ability triggers twice, returning Workshop Assistant and the nontoken artifact with mana one or less to your hand from your graveyard.
3. Cast Workshop Assistant and the nontoken artifact by paying at most 4.
4. Activate Krark-Clan Ironworks twice by sacrificing the nontoken artifact and Workshop Assistant, adding CCCC.
5. When Workshop Assistant dies, it triggers twice, returning the nontoken artifact and Myr Retriever to your hand from your graveyard.
6. Cast the nontoken artifact and Myr Retriever by paying at most 3.
7. Repeat.