Jegantha, the Wellspring + Horde of Notions + Samut, Voice of Dissent + Yahenni, Undying Partisan

Jegantha, the Wellspring

Horde of Notions

Samut, Voice of Dissent

Yahenni, Undying Partisan

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 intricate five-color loop begins by tapping Jegantha, the Wellspring to generate the exact colored mana required to fuel Horde of Notions' activated ability, neatly bypassing the restriction that Jegantha's mana cannot pay generic costs. You then use Yahenni, Undying Partisan to sacrifice Jegantha, sending it to the graveyard where Horde of Notions can immediately play it back onto the battlefield for free. While the step-by-step loop relies on those primary actors, Samut, Voice of Dissent quietly enables the entire engine by granting haste across your board so everything is ready to run at a moment's notice. By repeating this cycle, you effortlessly generate infinite death triggers and sacrifice counts to power up Yahenni, Undying Partisan alongside an endless stream of creature entering and leaving the battlefield.