Mikaeus, the Unhallowed + Blasting Station + Heirloom Auntie

Mikaeus, the Unhallowed

Blasting Station

Heirloom Auntie

How it works

1. Activate Blasting Station by tapping it and sacrificing Heirloom Auntie.
2. When Heirloom Auntie dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
3. When Heirloom Auntie enters, Blasting Station triggers, untapping Blasting Station.
4. Resolve the Blasting Station ability from step 1
5. Repeat.