Jegantha, the Wellspring + Horde of Notions + Carrion Feeder + The Fire Crystal

Jegantha, the Wellspring

Horde of Notions

Carrion Feeder

The Fire Crystal

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Carrion Feeder 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 looping engine puts Jegantha, the Wellspring right into the graveyard using Carrion Feeder's sacrifice ability, which conveniently feeds a steady stream of +1/+1 counters onto the Feeder. From there, Horde of Notions uses the exact five-color mana generated by tapping Jegantha, the Wellspring to play Jegantha right back out of the graveyard for free. While The Fire Crystal isn't strictly required to execute the loop, its passive haste grants your newly resurrected companion immediate readiness to tap again, completing a self-sustaining cycle of life and death.