If Morselhoarder has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it, adding one mana of any color.
Repeat step 1 as necessary until Morselhoarder has no -1/-1 counters on it.
Activate Blasting Station by tapping it and sacrificing Morselhoarder.
When Morselhoarder dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Morselhoarder enters, Blasting Station triggers, untapping Blasting Station.
Resolve the Blasting Station ability from step 3.
Repeat.
This clever loop transforms your board into a relentless engine of destruction by turning death into fuel. With the back face of Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight granting persist to your other nontoken creatures, Morselhoarder returns to the battlefield with a -1/-1 counter whenever it dies. Fortunately, Morselhoarder's own ability lets you strip away its -1/-1 counters to generate colored mana before you sacrifice it to Blasting Station. Every time Morselhoarder enters the battlefield anew, Blasting Station untaps itself thanks to its built-in trigger, letting you repeat the sacrifice loop endlessly to pepper any target with infinite damage.