Ruxa, Patient Professor + Nim Deathmantle + Ashnod's Altar + Phyrexian Walker

Ruxa, Patient Professor

Nim Deathmantle

Ashnod's Altar

Phyrexian Walker

How it works

1. Activate Ashnod's Altar by sacrificing Phyrexian Walker, adding CC.
2. When Phyrexian Walker dies, Nim Deathmantle triggers, choose not to pay for the trigger.
3. Activate Ashnod's Altar by sacrificing Ruxa, adding CC.
4. When Ruxa dies, Nim Deathmantle triggers, causing you to pay 4 to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
5. When Ruxa enters the battlefield, its first ability triggers, returning Phyrexian Walker to your hand from your graveyard.
6. Cast Phyrexian Walker by paying 0.
7. Repeat.

This clever engine revolves around sacrificing Phyrexian Walker to Ashnod's Altar to generate mana, which is then used to pay for Nim Deathmantle's triggered ability when Ruxa, Patient Professor also hits the graveyard. Ruxa, Patient Professor is essential here because its enters-the-battlefield trigger conveniently plucks Phyrexian Walker right back out of the graveyard into your hand, letting you recast the zero-mana artifact creature for free to restart the loop. While the step-by-step trace focuses entirely on the active sacrifice and recursion loop, Ruxa's static abilities even grant your creatures a nice power boost and unblocked combat damage potential if you ever decide to pivot into attacking.