Sin, Unending Cataclysm + Thornbite Staff + Blasting Station + Selvala, Heart of the Wilds

Sin, Unending Cataclysm

Thornbite Staff

Blasting Station

Selvala, Heart of the Wilds

How it works

1. Cast Sin either from your hand or command zone by paying 5 plus commander tax if applicable.
2. As Sin enters, remove all counters from all artifacts, enchantments and creatures you control, putting twice that many +1/+1 counters on Sin.
3. When Sin enters, Blasting Station triggers, untapping Blasting Station.
4. Activate Selvala by paying and tapping it, adding at least plus an additional X equal to Sin's power minus 3.
5. Activate Blasting Station by tapping it and sacrificing Sin.
6. Choose to return Sin to the command zone from your graveyard.
7. When Sin dies, it and Selvala trigger.
8. Resolve the Sin trigger, putting its counters on Selvala.
9. Resolve the Selvala trigger, untapping it.
10. Resolve the Blasting Station ability.
11. Repeat.

This clever loop revolves around repeatedly casting and sacrificing Sin, Unending Cataclysm to turn your own permanents' counters into a massive lethal engine. As Sin enters, its replacement effect strips counters off your side of the board to grow huge, which immediately primes Selvala, Heart of the Wilds to produce an enormous burst of mana and draw you cards via its power-tracking ability. Meanwhile, Thornbite Staff and Blasting Station form the mechanical heart of the loop: Blasting Station hurls Sin at any target while its untap trigger—alongside Thornbite Staff's death-untap ability—resets everything whenever a creature enters or dies. You simply let Sin return to the command zone upon dying to restart the cycle, piling its staggering +1/+1 counters onto Selvala along the way to fuel infinite damage, mana, and sacrifices.