Teshar, Ancestor's Apostle + Salvager of Ruin + Phyrexian Walker + Yahenni, Undying Partisan

Teshar, Ancestor's Apostle

Salvager of Ruin

Phyrexian Walker

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Phyrexian Walker.
2. Activate Salvager of Ruin by sacrificing it, returning Phyrexian Walker from your graveyard to your hand.
3. Cast Phyrexian Walker by paying 0.
4. Teshar triggers, returning Salvager of Ruin from your graveyard to the battlefield.
5. Repeat.

This elegant loop relies on the zero-mana cost of Phyrexian Walker to repeatedly fuel a recycling cycle between the graveyard and the battlefield. Once you sacrifice the Walker to Yahenni, Undying Partisan, you can immediately crack Salvager of Ruin to pull the Walker right back to your hand. Recasting that free artifact triggers Teshar, Ancestor's Apostle, which dutifully pulls the Salvager of Ruin back from the grave to do it all over again.