Activate Blasting Station by tapping it and sacrificing Melira's Keepers
When Melira's Keepers dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to its static effect.
When Melira's Keepers enters, Blasting Station triggers, untapping Blasting Station.
Resolve the Blasting Station ability from step 1.
Repeat.
By leveraging the passive protection of Melira's Keepers, which prevents counters from being placed on it, we can bypass the usual downside of the persist mechanic granted by Isilu, Carrier of Twilight (the back face of Eirdu, Carrier of Dawn). Each time Blasting Station sacrifices Melira's Keepers to deal a point of damage, the creature returns to the battlefield immediately. Thanks to Melira's Keepers's static ability, it shrugs off the expected -1/-1 counter entirely, allowing Blasting Station's enter-the-battlefield trigger to untap the artifact and ready it for the next loop.