Mikaeus, the Unhallowed + Blasting Station + Soulstinger

Mikaeus, the Unhallowed

Blasting Station

Soulstinger

How it works

1. Activate Blasting Station by tapping it and sacrificing Soulstinger.
2. When Soulstinger 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 Soulstinger enters, Blasting Station triggers, untapping Blasting Station.
4. Resolve the Blasting Station ability from step 1
5. Repeat.

This clever loop relies on Mikaeus, the Unhallowed to grant undying to our non-Human pieces, ensuring that sacrificing Soulstinger to Blasting Station doesn't actually spell its permanent end. Because Soulstinger returns with a +1/+1 counter, the +1/+1 counter and any -1/-1 counters it accumulates will naturally annihilate each other through state-based actions, leaving the creature completely clean for the next iteration. As you repeat this cycle, Blasting Station happily untaps upon each entry to repeatedly ping any target for infinite damage while churning out infinite sacrifice, death, and entry triggers.