Jegantha, the Wellspring + Horde of Notions + Temur Ascendancy + Altar of Dementia

Jegantha, the Wellspring

Horde of Notions

Temur Ascendancy

Altar of Dementia

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Altar of Dementia by sacrificing Jegantha.
3. Activate Horde of Notions by paying , causing you to cast Jegantha from your graveyard without paying its mana cost.
4. When Jegantha enters, Temur Ascendancy triggers, allowing you to draw a card.
5. Repeat.

This loop sets up an ingenious self-sustaining engine using Jegantha, the Wellspring to pay for its own revival through Horde of Notions, which requires the exact five-color restriction that Jegantha's tap ability conveniently provides. Every time Jegantha re-enters the battlefield, Temur Ascendancy rewards your efforts by drawing you a card thanks to Jegantha's power of 4 or greater, while simultaneously granting the haste needed to immediately tap it again. Finally, Altar of Dementia converts those recurring sacrifices into an infinite supply of mill for your opponents (or yourself), turning this elemental recursion loop into a devastating win condition.