Wall of Roots + Agatha's Soul Cauldron + Tayam, Luminous Enigma + Grim Initiate + Phyrexian Altar

Wall of Roots

Agatha's Soul Cauldron

Tayam, Luminous Enigma

Grim Initiate

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Grim Initiate, adding mana.
2. When Grim Initiate dies, 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. Activate [[Tayam]] by paying 3 and removing three counters from creatures you control, milling three cards and returning Grim Initiate from your graveyard to the battlefield with a vigilance counter on it.
4. Declare that you are activating Tayam's ability again, so state-based actions will not be checked until the ability is activated.
5. 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 .
6. Complete the activation by paying 3 and removing a vigilance counter and a -0/-1 counter from the creature token and a vigilance counter from Grim Initiate.
7. Holding priority, activate Phyrexian Altar twice by sacrificing Grim Initiate and the creature token, adding mana.
8. When Grim Initiate dies, it triggers, creating a 0/0 creature token with a +1/+1 counter on it as well as a vigilance counter due to Tayam.
9. Resolve Tayam's ability, milling three cards and returning Grim Initiate from your graveyard to the battlefield with a vigilance counter on it.
10. Repeat from step 4.