Morophon, the Boundless + Saffi Eriksdotter + Eternal Witness + Blasting Station

Morophon, the Boundless

Saffi Eriksdotter

Eternal Witness

Blasting Station

How it works

1. Activate Saffi by sacrificing it, targeting Eternal Witness.
2. Activate Blasting Station by tapping it and sacrificing Eternal Witness.
3. When Eternal Witness dies, Saffi triggers, returning Eternal Witness from your graveyard to the battlefield.
4. When Eternal Witness enters the battlefield, it and Blasting Station trigger.
5. Resolve the Eternal Witness trigger, returning Saffi from your graveyard to your hand.
6. Resolve the Blasting Station trigger, untapping it.
7. Resolve the Blasting Station ability from step 2, dealing 1 damage to any target.
8. Cast Saffi by paying 0 due to Morophon.
9. When Saffi enters the battlefield, Blasting Station triggers, untapping it.
10. Repeat.

This recursive loop turns your graveyard into a lethal firing range by using Saffi Eriksdotter to endlessly rescue Eternal Witness from death. As Eternal Witness repeatedly enters the battlefield, its triggered ability grabs Saffi right back to your hand, while Morophon, the Boundless steps in to make recasting Saffi completely free by slashing away its colored mana requirement. Meanwhile, Blasting Station acts as both the sacrificial outlet and the win condition, untapping itself with every creature entry so it can continually hurl damage at any target until the game is won.