Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Sin, Unending Cataclysm + Blasting Station

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Sin, Unending Cataclysm

Blasting Station

How it works

1. Activate Blasting Station by tapping it and sacrificing the additional creature.
2. When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When the creature enters, Blasting Station triggers, untapping Blasting Station.
4. Resolve the Blasting Station ability from step 1
5. Activate Blasting Station by tapping it and sacrificing Sin.
6. When Sin dies, it triggers twice.
7. Resolve the first trigger, returning Sin from your graveyard to the battlefield with a -1/-1 counter on it. As Sin enters, remove the -1/-1 counter from the creature sacrificed in step 1, causing Sin to enter with a +1/+1 counter on it instead.
8. When Sin enters, Blasting Station triggers, untapping Blasting Station.
9. Resolve the second Sin trigger, putting the counters it had on it when it was sacrificed onto a creature you control and failing to shuffle it into your library as it's no longer in your graveyard.
10. Resolve the Blasting Station ability from step 5
11. Repeat.