Teshar, Ancestor's Apostle + Scrap Trawler + Krark-Clan Ironworks + Welding Jar

Teshar, Ancestor's Apostle

Scrap Trawler

Krark-Clan Ironworks

Welding Jar

How it works

1. Cast Welding Jar by paying its mana cost.
2. Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
3. Activate Welding Jar by sacrificing it.
4. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler.
5. When Scrap Trawler dies, it triggers, returning Welding Jar from your graveyard to your hand.
6. Repeat.

This loop transforms a humble zero-mana artifact into an infinite engine by leveraging Teshar, Ancestor's Apostle and Scrap Trawler as a recursive feedback loop. When you cast Welding Jar, Teshar's historic trigger pulls Scrap Trawler back from the graveyard, setting the stage for Krark-Clan Ironworks to sacrifice Scrap Trawler for colorless mana. That sacrifice triggers Scrap Trawler's ability, allowing you to recur Welding Jar right back to your hand so you can cast it again and repeat the cycle endlessly.