Agatha's Soul Cauldron + Wildwood Mentor + Ashnod's Altar + Pentavus

Agatha's Soul Cauldron

Wildwood Mentor

Ashnod's Altar

Pentavus

How it works

1. Activate Wildwood Mentor by using Pentavus's first ability by paying 1 and removing a +1/+1 counter from it, creating a 1/1 Pentavite artifact creature token.
2. When the Pentavite enters the battlefield, Wildwood Mentor's first ability triggers, putting a +1/+1 counter on itself.
3. Activate Ashnod's Altar by sacrificing the Pentavite, adding CC.
4. Repeat.
5. Once you have infinite mana, you may forego sacrificing the Pentavites.
6. Once you have infinite creature tokens, you may activate Wildwood Mentor using Pentavus's last ability any number of times.

This intricate loop turns the modular machinery of Pentavus into a self-sustaining engine, fueled by Ashnod's Altar to generate an endless surplus of colorless mana and sacrifice triggers. The key to bridging these pieces together is Agatha's Soul Cauldron, which grants Pentavus its crucial activated abilities across the board—allowing you to continually spend the Altar's mana to pop out Pentavites. Meanwhile, Wildwood Mentor watches the chaos unfold, feeding every entering token a fresh +1/+1 counter while positioning itself to unleash arbitrarily massive attacks once your setup is complete.