Doc Aurlock, Grizzled Genius + Rest in Peace + Eternal Scourge + Phyrexian Altar

Doc Aurlock, Grizzled Genius

Rest in Peace

Eternal Scourge

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Eternal Scourge, adding 1.
2. Eternal Scourge is exiled instead of being put into your graveyard due to Rest in Peace.
3. Cast Eternal Scourge from exile by paying 1.
4. Repeat.

This loop is a masterclass in turning replacement effects into an engine, all anchored by Rest in Peace ensuring that no card ever actually reaches the graveyard. Because Eternal Scourge can be cast directly from exile, and Doc Aurlock, Grizzled Genius reduces the cost of spells cast from exile by {2}, the Scourge becomes completely free to cast—costing zero mana instead of three. You simply cast Eternal Scourge, sacrifice it to Phyrexian Altar for a mana of any color, and let Rest in Peace route it right back to exile, ready to be cast again for free.