Yenna, Redtooth Regent + Angelic Renewal + Ashnod's Altar + Shang-Chi, Master of Kung Fu

Yenna, Redtooth Regent

Angelic Renewal

Ashnod's Altar

Shang-Chi, Master of Kung Fu

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.