Wall of Roots + Agatha's Soul Cauldron + Tayam, Luminous Enigma + Gleaming Overseer + Thermopod

Wall of Roots

Agatha's Soul Cauldron

Tayam, Luminous Enigma

Gleaming Overseer

Thermopod

How it works

1. Cast Gleaming Overseer by paying its mana cost; it enters with a vigilance counter due to Tayam.
2. When Gleaming Overseer enters, it triggers, creating a 0/0 creature token with a +1/+1 counter on it as well as a vigilance counter due to Tayam.
3. Declare that you are activating Tayam's ability, so state-based actions will not be checked until the ability is activated.
4. While paying that ability's cost, activate the creature token using the Wall of Roots mana ability from Agatha's Soul Cauldron by putting a -0/-1 counter on it, adding .
5. Complete the activation by paying 3 and removing a vigilance counter from each of the two creatures and a -0/-1 counter from the Army token.
6. Holding priority, activate Thermopod twice by sacrificing Gleaming Overseer and the creature token, adding two mana.
7. Resolve Tayam's ability, milling three and returning Gleaming Overseer from your graveyard to the battlefield with a vigilance counter on it.
8. Repeat from step 2.

This intricate engine centers on Agatha's Soul Cauldron to turn your creatures into mana-producing powerhouses by granting them Wall of Roots's activated ability, allowing them to self-counter for mana right as you pay the costs for Tayam, Luminous Enigma. Meanwhile, Gleaming Overseer handles the fodder by providing the initial bodies that receive counters from Tayam's static vigilance-granting presence and its own entry trigger, giving you the exact fuel needed to repeatedly pay Tayam's activation cost. Once the loop is spinning, Thermopod acts as the ultimate sacrifice outlet to turn those recycled permanents into red mana while looping Gleaming Overseer endlessly in and out of the graveyard.