When Dargo enters the battlefield, Blasting Station triggers, untapping Blasting Station.
Activate Earthcraft by tapping Dargo, untapping a basic Mountain.
Activate Blasting Station by tapping it and sacrificing Dargo.
Choose to return Dargo from your graveyard to the command zone.
Resolve the Blasting Station ability, dealing 1 damage to any target.
Repeat.
This clever loop relies on Dargo, the Shipwrecker and his remarkably cheap command zone casting cost to continually churn out sacrifices. By tapping Dargo to Earthcraft, you can untap a basic Mountain to pay for his initial {R} casting cost, feeding a continuous cycle of enters-the-battlefield and leave-the-battlefield triggers. Blasting Station acts as both the designated executioner—sacrificing Dargo to deal 1 damage to any target—and the mechanical engine that untaps itself each time Dargo re-enters the battlefield, allowing you to seamlessly repeat the entire execution.