Teshar triggers, returning Scrap Trawler from your graveyard to the battlefield.
When Scrap Trawler enters, Blasting Station triggers, untapping Blasting Station.
Activate Delif's Cone by tapping and sacrificing it.
Activate Blasting Station by tapping it and sacrificing Scrap Trawler.
When Scrap Trawler dies, it triggers, returning Delif's Cone from your graveyard to your hand.
Resolve the Blasting Station ability.
Repeat.
This clever little loop turns the humble Delif's Cone into a lethal engine by leveraging the recursive power of Teshar, Ancestor's Apostle. When you cast your historic artifact, Teshar plucks Scrap Trawler out of your graveyard, which in turn untaps Blasting Station to prepare for the kill. By sacrificing Scrap Trawler to Blasting Station, Scrap Trawler's ability triggers to return Delif's Cone straight back to your hand, ready to be cast again. Blasting Station provides the final execution by turning every cycle of this artifact-recycling loop into infinite damage for your opponents.