Jegantha, the Wellspring + Horde of Notions + Phyrexian Altar + Yarus, Roar of the Old Gods

Jegantha, the Wellspring

Horde of Notions

Phyrexian Altar

Yarus, Roar of the Old Gods

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Phyrexian Altar by sacrificing Jegantha.
3. Activate Horde of Notions by paying , causing you to cast Jegantha from your graveyard without paying its mana cost.
4. Repeat.

This clever loop relies on Horde of Notions acting as an elemental recursion engine to continuously pull Jegantha, the Wellspring straight out of your graveyard without paying its mana cost. Each time Jegantha returns, you tap it for a colorful infusion of colored mana, which is then fed directly into Phyrexian Altar by sacrificing Jegantha to pay the exact color requirements needed to activate Horde of Notions all over again. While Yarus, Roar of the Old Gods isn't strictly required to keep the core mana loop spinning, its presence gives the combo a terrifying secondary dimension by granting all your creatures haste and turning your endless cycles into a massive advantage engine.