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

Yenna, Redtooth Regent

Agatha's Soul Cauldron

Ashnod's Altar

Pestermite

How it works

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

This ingenious loop uses Agatha's Soul Cauldron to grant Pestermite's untap ability to Yenna, Redtooth Regent, letting her tap to copy Pestermite while it is formatted as an enchantment. Thanks to Yenna's specific clause for copying Auras, each token copy untaps Yenna upon entering the battlefield. Finally, Ashnod's Altar steps in to sacrifice that newly created token, generating the mana needed to fuel Yenna's ability over and over again.