Sephara, Sky's Blade + Faces of the Past + Enduring Renewal + Phyrexian Altar

Sephara, Sky's Blade

Faces of the Past

Enduring Renewal

Phyrexian Altar

How it works

1. Cast Sephara by paying and tapping four Angels with flying.
2. Activate Phyrexian Altar by sacrificing Sephara, adding .
3. When Sephara dies, Enduring Renewal and Faces of the Past trigger.
4. Resolve the Enduring Renewal trigger, returning Sephara from your graveyard to your hand.
5. Resolve the Faces of the Past trigger, untapping all Angels.
6. Repeat.

This ingenious loop relies on a clever intersection of cost reduction, sacrifice, and recursive triggers to achieve an infinite engine. You cast Sephara, Sky's Blade for a mere white mana by tapping your flying creatures, using her alternative casting cost to get her onto the battlefield on the cheap. Once she's there, you feed her to Phyrexian Altar to generate the exact mana needed to replay her, while her death simultaneously triggers Enduring Renewal to bounce her straight back to your hand and Faces of the Past to untap your entire angelic flock.