Jegantha, the Wellspring + Horde of Notions + Goblin Bombardment + Fervor

Jegantha, the Wellspring

Horde of Notions

Goblin Bombardment

Fervor

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Goblin Bombardment 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 loop turns Jegantha, the Wellspring into an endlessly recurring engine, using its own unique color-restricted mana to pay for the ability of Horde of Notions that pulls it straight back from the graveyard. Because Fervor immediately grants haste to everything you control, the freshly returned Jegantha can be tapped again right away for its full five-color allotment without skipping a beat. Goblin Bombardment provides the sacrificial outlet that neatly triggers this cycle while converting each iteration into direct damage against any target.