Jegantha, the Wellspring + Horde of Notions + Phyrexian Altar + Garna, the Bloodflame

Jegantha, the Wellspring

Horde of Notions

Phyrexian Altar

Garna, the Bloodflame

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 loop is a masterclass in recycling, fueled entirely by the strict color requirements of Jegantha, the Wellspring and Horde of Notions. You tap Jegantha to generate the exact five-color mana restriction needed to fuel Horde of Notions' ability, then use Phyrexian Altar to sacrifice Jegantha and simultaneously refund you with a clean, unrestricted colored mana. Because Jegantha is an Elemental, Horde of Notions can continuously pull it straight from your graveyard back onto the battlefield, creating a self-sustaining engine. While Garna, the Bloodflame isn't strictly necessary for the core loop since Horde of Notions casts Jegantha directly, Garna's passive haste and return-to-hand trigger can easily tie a broader Elemental-heavy strategy together into an unstoppable wave of sacrifices and recursion.