Jegantha, the Wellspring + Horde of Notions + Yahenni, Undying Partisan + Anger

Jegantha, the Wellspring

Horde of Notions

Yahenni, Undying Partisan

Anger

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Yahenni 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 and its color-intensive ability to repeatedly pull Jegantha, the Wellspring right back out of the graveyard for free, transforming Jegantha's restriction against generic mana costs into the exact fuel needed to keep the Elemental monarch active. Yahenni, Undying Partisan serves as the sacrificial outlet that neatly sends Jegantha back to the graveyard to trigger the loop while growing larger with every iteration, and Anger makes sure your creatures have haste as long as it sits in the graveyard alongside a Mountain. Together, they create a perpetual cycle of rebirth that generates infinite deaths, entering-the-battlefield triggers, and storm count.