Jegantha, the Wellspring + Horde of Notions + Shilgengar, Sire of Famine + Tannuk, Steadfast Second

Jegantha, the Wellspring

Horde of Notions

Shilgengar, Sire of Famine

Tannuk, Steadfast Second

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Shilgengar 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 relies on Horde of Notions and its ability to cast Elementals from the graveyard, utilizing Jegantha, the Wellspring as the target since Jegantha happens to be an Elemental. To fuel this recursion, Shilgengar, Sire of Famine stands ready to sacrifice Jegantha for a Blood token whenever needed. Meanwhile, Tannuk, Steadfast Second ensures that Jegantha's hasty return to the battlefield lets it tap immediately for the exact five-color mana requirement ({W}{U}{B}{R}{G}) needed to pay for Horde of Notions' ability, creating an endless cycle of sacrifice and revival.