Teshar triggers, returning Dream Stalker from your graveyard to the battlefield.
When Dream Stalker enters, it and Blasting Station trigger.
Resolve the Dream Stalker trigger, returning another artifact that can be cast for 0 from the battlefield to your hand.
Resolve the Blasting Station trigger, untapping it.
Resolve the artifact spell cast in step 1.
Activate Blasting Station by tapping it and sacrificing Dream Stalker
Repeat.
This ingenious loop turns zero-mana artifacts into a relentless engine of destruction by leveraging Teshar, Ancestor's Apostle as your ultimate resurrection machine. Whenever you cast a historic spell, Teshar pulls Dream Stalker right back out of your graveyard, setting off a cascading chain of triggers. As Dream Stalker enters the battlefield, its own drawback is cleverly turned into an asset by bouncing your free artifact back to hand, while simultaneously untapping Blasting Station thanks to that artifact's creature-entry trigger. Finally, you sacrifice Dream Stalker to Blasting Station to fling a point of damage at any target, clearing the path to recast your zero-mana artifact and do it all over again.