The Sibsig Ceremony + Scrap Trawler + Workshop Assistant + Temur Battlecrier

The Sibsig Ceremony

Scrap Trawler

Workshop Assistant

Temur Battlecrier

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 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 Workshop Assistant from your graveyard to your hand.
7. Repeat.
8. Cast the artifact creature in your hand by paying 0.
9. When the artifact creature enters, The Sibsig Ceremony triggers, destroying the creature and creating a 2/2 Zombie Druid creature token.
10. When the creature dies, Scrap Trawler triggers, returning Workshop Assistant from your graveyard to your hand.
11. Cast Workshop Assistant by paying 0.
12. When Workshop Assistant enters, The Sibsig Ceremony triggers, destroying Workshop Assistant and creating a 2/2 Zombie Druid creature token.
13. When Workshop Assistant dies, it and Scrap Trawler trigger.
14. Resolve the Workshop Assistant trigger, returning the artifact creature cast in step 1 from your graveyard to your hand.
15. Reoslve the Scrap Trawler trigger, returning nothing.
16. Repeat.