Jegantha, the Wellspring + Horde of Notions + Phyrexian Altar + Fervor

Jegantha, the Wellspring

Horde of Notions

Phyrexian Altar

Fervor

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 turns Jegantha, the Wellspring into a self-sustaining engine by exploiting its unique color-restricted mana alongside Phyrexian Altar's sacrifice ability to fully fund Horde of Notions's activation cost. Because Jegantha itself is an Elemental, Horde of Notions can continuously pull it straight from the graveyard back onto the battlefield for free, fueling an endless cycle of sacrifices. Meanwhile, Fervor ensures that Jegantha gains haste the moment it returns, allowing it to tap immediately for its five-color mana production without missing a beat.