The Sibsig Ceremony + Myr Retriever + Scrap Trawler + The Immortal Sun

The Sibsig Ceremony

Myr Retriever

Scrap Trawler

The Immortal Sun

How it works

1. Cast Myr Retriever by paying 0.
2. When Myr Retriever enters the battlefield, The Sibsig Ceremony triggers, destroying Myr Retriever and creating a 2/2 Zombie Druid creature token.
3. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
4. Cast Scrap Trawler by paying 0.
5. When Scrap Trawler enters the battlefield, The Sibsig Ceremony triggers, destroying Scrap Trawler and creating a 2/2 Zombie Druid creature token.
6. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
7. Repeat.

This clever loop relies on stacking cost reductions to drop your artifacts for free, turning the graveyard into your personal hand. With both The Sibsig Ceremony and The Immortal Sun lowering creature and artifact costs to zero, casting Myr Retriever or Scrap Trawler costs nothing. Once either mechanical marvel hits the battlefield, The Sibsig Ceremony immediately destroys it to produce a Zombie Druid token, sending the creature straight to the graveyard. That death triggers Myr Retriever to rescue Scrap Trawler from the graveyard, and vice versa—supported by Scrap Trawler's own death trigger to continuously bounce the other artifact back to your hand for the next zero-mana cast.