Yenna, Redtooth Regent + Angelic Renewal + Ashnod's Altar + Mass Hysteria

Yenna, Redtooth Regent

Angelic Renewal

Ashnod's Altar

Mass Hysteria

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of Angelic Renewal.
2. Activate Ashnod's Altar by sacrificing Yenna, adding CC.
3. When Yenna dies, both Angelic Renewals trigger.
4. Resolve the first trigger, choosing to sacrifice either Angelic Renewal and return Yenna from your graveyard to the battlefield.
5. Resolve the second trigger, choosing not to pay.
6. Repeat.

This clever loop turns Yenna, Redtooth Regent into an endless engine of resurrection by exploiting how copying works with triggers. With Mass Hysteria granting haste so Yenna can tap the moment she returns, you use her ability to spin out a fresh token copy of Angelic Renewal; you then sacrifice Yenna to Ashnod's Altar for mana while generating a flurry of redundant triggers from the original and copied enchantments. Each iteration lets you feed the original Angelic Renewal to bring Yenna right back to the battlefield, entirely self-sustaining thanks to the mana generated by Ashnod's Altar.