Jegantha, the Wellspring + Horde of Notions + Goblin Bombardment + Tannuk, Steadfast Second

Jegantha, the Wellspring

Horde of Notions

Goblin Bombardment

Tannuk, Steadfast Second

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 relies on Jegantha, the Wellspring to generate the exact five-color mana requirement for Horde of Notions, which can then pull Jegantha right back out of the graveyard for free thanks to its activated ability. To close the loop, Goblin Bombardment provides the sacrifice outlet needed to bin Jegantha and simultaneously convert the endless cycle into lethal damage. Meanwhile, Tannuk, Steadfast Second ensures that Jegantha gains the haste it needs the moment it enters the battlefield so that it can be tapped for mana immediately without summoning sickness slowing you down.