Vizier of Remedies + Blasting Station + Heartmender

Vizier of Remedies

Blasting Station

Heartmender

How it works

1. Activate Blasting Station by tapping it and sacrificing Heartmender.
2. When Heartmender dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Vizier of Remedies.
3. When Heartmender enters, Blasting Station triggers, untapping Blasting Station
4. Resolve the Blasting Station ability from step 1
5. Repeat.