Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
Activate Delif's Cone by tapping and sacrificing it.
Activate Phyrexian Altar by sacrificing Scrap Trawler.
When Scrap Trawler dies, it triggers, returning Delif's Cone from your graveyard to your hand.
Repeat.
This clever loop turns humble artifacts into an engine of limitless power, anchored by the legendary bird wizard Teshar, Ancestor's Apostle, whose historic spellcasting trigger plucks Scrap Trawler straight from the graveyard. While Scrap Trawler's death trigger recycles cheaper artifacts from the bin, it conveniently feeds itself and Delif's Cone right into the jaws of Phyrexian Altar to generate a steady stream of colored mana. Sacrificing Delif's Cone to the Altar triggers the Trawler to bounce the Cone back to your hand, allowing you to recast it as a historic spell that restarts the entire cycle with Teshar.