Tarrian's Soulcleaver + Herd Baloth + Phyrexian Altar

Tarrian's Soulcleaver

Herd Baloth

Phyrexian Altar

How it works

1. Put a +1/+1 counter on Herd Baloth.
2. Herd Baloth triggers, creating a 4/4 Beast creature token.
3. Activate Phyrexian Altar by sacrificing the Beast, adding one mana of any color.
4. When the Beast dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Herd Baloth.
5. Repeat from step 2.

This elegant loop transforms the humble Herd Baloth into a self-sustaining mana factory, cleverly leveraging its ability to spawn a 4/4 Beast token whenever it receives a +1/+1 counter. To fuel the engine, Phyrexian Altar provides the crucial sacrifice outlet that converts each newly born Beast into a steady stream of colored mana. Meanwhile, Tarrian's Soulcleaver serves as the vital connective tissue, passively watching the graveyard to catch every dying token and instantly feed another +1/+1 counter back onto the Herd Baloth to restart the entire cycle.