The Sibsig Ceremony + Myr Retriever + Workshop Assistant + Cemetery Prowler

The Sibsig Ceremony

Myr Retriever

Workshop Assistant

Cemetery Prowler

How it works

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

This clever loop relies on cost reduction to cast artifacts for free, turning a self-sustaining cycle into an infinite engine. With Cemetery Prowler exiling a card type to shave {1} off your artifact spells and The Sibsig Ceremony providing an additional {2} reduction, both Workshop Assistant and Myr Retriever can be cast for zero mana. Once on the battlefield, The Sibsig Ceremony immediately destroys the newly cast automaton, sending it to the graveyard and triggering its death ability to return the *other* automaton from your graveyard right back to your hand.