Infinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite death triggersInfinite self-millInfinite colorless manaInfinite green mana
How it works
Activate Ashnod's Altar by sacrificing Grim Initiate, adding .
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.
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.
Declare that you are activating Tayam's ability again, so state-based actions will not be checked until the ability is activated.
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 .
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.
Holding priority, activate Ashnod's Altar twice by sacrificing Grim Initiate and the creature token, adding .
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.
Resolve Tayam's ability, milling three cards and returning Grim Initiate from your graveyard to the battlefield with a vigilance counter on it.