Jegantha, the Wellspring + Horde of Notions + Temur Ascendancy + Yahenni, Undying Partisan

Jegantha, the Wellspring

Horde of Notions

Temur Ascendancy

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. When Jegantha enters, Temur Ascendancy triggers, allowing you to draw a card.
5. Repeat.

This clever engine uses Jegantha, the Wellspring as both its own mana source and the recurring sacrifice fodder for Yahenni, Undying Partisan, turning the exact colored mana requirement of Horde of Notions into a closed loop. Because Horde of Notions casts Jegantha from the graveyard for free using that specific five-color activation, every single cycle brings Jegantha right back to the battlefield. Meanwhile, Temur Ascendancy capitalizes on this constant motion by giving you a card draw trigger every time Jegantha re-enters with a power of 4 or greater, letting you dig through your deck indefinitely.