Jegantha, the Wellspring + Horde of Notions + Blasting Station + Fires of Yavimaya

Jegantha, the Wellspring

Horde of Notions

Blasting Station

Fires of Yavimaya

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Blasting Station by tapping it and 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, Blasting Station triggers, untapping Blasting Station.
5. Repeat.

This dazzling five-color loop begins by tapping Jegantha, the Wellspring for the exact colored mana needed to fuel Horde of Notions' activated ability, entirely bypassing its rigid color requirements. When Horde of Notions pulls Jegantha, the Wellspring straight out of your graveyard for free, the returning creature triggers Blasting Station's second ability to untap itself so it can immediately sacrifice Jegantha, the Wellspring again. Meanwhile, Fires of Yavimaya quietly ensures your whole board is ready to act with haste, though here the true engine relies on Blasting Station's sacrificial ammunition looping infinitely to deal endless damage to any target.