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

Wall of Roots

Agatha's Soul Cauldron

Tayam, Luminous Enigma

Ashnod's Altar

Biomathematician

How it works

1. Cast Biomathematician by paying its mana cost; it enters with a vigilance counter due to Tayam.
2. When Biomathematician enters, it triggers, creating a 0/0 Fractal creature token with a vigilance counter due to Tayam, then putting a +1/+1 counter on each Fractal you control.
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 Fractal token.
6. Holding priority, activate Ashnod's Altar twice by sacrificing Biomathematician and the creature token, adding .
7. Resolve Tayam's ability, milling three and returning Biomathematician from your graveyard to the battlefield with a vigilance counter on it.
8. Repeat from step 2.