Sin, Unending Cataclysm + Intruder Alarm + Blasting Station + Arbor Adherent

Sin, Unending Cataclysm

Intruder Alarm

Blasting Station

Arbor Adherent

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, Intruder Alarm and Blasting Station trigger, untapping all creatures and Blasting Station.
4. Activate Arbor Adherent by tapping it, adding an amount of or equal to Sin's toughness.
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 triggers, putting its counters on Arbor Adherent.
8. Resolve the Blasting Station ability.
9. Repeat.

This loop turns Sin, Unending Cataclysm's massive size into a devastating engine by looping its commander cast over and over. As Sin enters, it strips counters from your permanents to grow into a giant threat, which simultaneously triggers Intruder Alarm and Blasting Station to ready your board. You tap Arbor Adherent for a mountain of colored mana scaled to Sin's colossal toughness, then use Blasting Station to sacrifice Sin—sending it back to the command zone to restart the cycle. Each iteration leaves Arbor Adherent permanently larger thanks to Sin's death trigger transferring its counters, ensuring your mana production snowballs while Blasting Station burns down the table.