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

Wall of Roots

Agatha's Soul Cauldron

Tayam, Luminous Enigma

Ashnod's Altar

Gleaming Overseer

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 Ashnod's Altar twice by sacrificing Gleaming Overseer and the creature token, adding .
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.