Wall of Roots + Agatha's Soul Cauldron + Tayam, Luminous Enigma + Ashnod's Altar + Aven Eternal

Wall of Roots

Agatha's Soul Cauldron

Tayam, Luminous Enigma

Ashnod's Altar

Aven Eternal

How it works

1. Cast Aven Eternal by paying its mana cost; it enters with a vigilance counter due to Tayam.
2. When Aven Eternal 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 Aven Eternal and the creature token, adding .
7. Resolve Tayam's ability, milling three and returning Aven Eternal from your graveyard to the battlefield with a vigilance counter on it.
8. Repeat from step 2.