Infinite artifact ETBInfinite artifact LTBInfinite artifact sacrifice triggersInfinite creature LTBInfinite creature ETBInfinite creature sacrifice triggersInfinite death triggersInfinite colorless manaInfinite storm countInfinite card draw at the beginning of the next upkeepInfinite draw triggers at the beginning of the next upkeep
How it works
Cast Urza's Bauble by paying its mana cost.
Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
Activate Urza's Bauble by tapping and sacrificing it.
Activate Krark-Clan Ironworks by sacrificing Scrap Trawler.
When Scrap Trawler dies, it triggers, returning Urza's Bauble from your graveyard to your hand.
Repeat.
This clever loop turns cheap artifacts into an engine by pairing Teshar, Ancestor's Apostle with Scrap Trawler to constantly recycle your board. When you cast Urza's Bauble, Teshar triggers to pull Scrap Trawler back from the graveyard, and sacrificing the Bauble to Krark-Clan Ironworks generates the mana you need to keep going. Scrap Trawler's death trigger then uses the Bauble's lesser mana value to return the Bauble right back to your hand, completing a closed circuit of endless recursion.