Jegantha, the Wellspring + Horde of Notions + Phyrexian Altar + The Fire Crystal

Jegantha, the Wellspring

Horde of Notions

Phyrexian Altar

The Fire Crystal

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 clever loop turns Jegantha, the Wellspring into an endless, self-sustaining sacrifice engine. By tapping Jegantha for its colored mana—which conveniently provides the exact five-color requirement needed to activate Horde of Notions—you can cast Jegantha right back out of your graveyard for free after feeding it to Phyrexian Altar for mana. While The Fire Crystal isn't strictly required to make the core loop function, its passive haste grants Jegantha immediate readiness upon return, and its cost-reduction and token-copying abilities make it a brilliant supporting artifact for your broader strategy.