Yenna, Redtooth Regent + Ashnod's Altar + Enchanted Evening + Sparring Mummy

Yenna, Redtooth Regent

Ashnod's Altar

Enchanted Evening

Sparring Mummy

How it works

1. Activate Yenna by paying 2 and tapping it, creating a token copy of Sparring Mummy.
2. When the Sparring Mummy token enters, it triggers, untapping Yenna.
3. Activate Ashnod's Altar by sacrificing the Sparring Mummy token, adding CC.
4. Repeat.

This intricate loop transforms Yenna, Redtooth Regent into an endless engine of creation by leaning on the reality-bending magic of Enchanted Evening, which turns every single permanent on the battlefield into an enchantment. With that global transformation active, Yenna can target a regular creature like Sparring Mummy to make a non-legendary token copy of it. When that Sparring Mummy token enters the battlefield, its own triggered ability untaps Yenna so she is ready to go again. Finally, Ashnod's Altar provides the {2} mana needed for Yenna's activation fee by casually sacrificing the Sparring Mummy token, turning every iteration into a self-sustaining cycle that generates an infinite storm of creature exits, entrances, sacrifices, and deaths.