Yenna, Redtooth Regent + Agatha's Soul Cauldron + Ashnod's Altar + Bounding Krasis

Yenna, Redtooth Regent

Agatha's Soul Cauldron

Ashnod's Altar

Bounding Krasis

How it works

1. Activate Bounding Krasis using the Licid's ability by paying its activation cost, attaching Bounding Krasis to Yenna and causing Bounding Krasis to become an Aura.
2. Activate Yenna by paying 2 and tapping it, creating a token copy of Bounding Krasis.
3. When the Bounding Krasis token enters, it triggers, untapping Yenna.
4. Activate Ashnod's Altar by sacrificing the Bounding Krasis token, adding CC.
5. Repeat from step 2.

This fascinating loop transforms Bounding Krasis into a self-replicating Aura that Yenna, Redtooth Regent can endlessly duplicate. By exiling Bounding Krasis into Agatha's Soul Cauldron, any creature you control with a +1/+1 counter gains its flash and enter-the-battlefield untap ability, allowing it to function just like the original creature while Yenna copies it. Ashnod's Altar then provides the colorless mana needed to continuously sacrifice the resulting Bounding Krasis token and fuel Yenna's activation cost over and over again.