Jegantha, the Wellspring + Horde of Notions + Fervor + Phantom Train

Jegantha, the Wellspring

Horde of Notions

Fervor

Phantom Train

How it works

1. Activate Jegantha by tapping it, adding that cannot be spent to pay generic mana costs.
2. Activate Phantom Train 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 brilliant loop turns Jegantha, the Wellspring into an endlessly recycling sacrifice fodder for Phantom Train, capitalizing on the Train's ability to boost itself while turning Jegantha into a Spirit creature. To keep the cycle going, Horde of Notions steps in by using its color-intensive ability to continuously pull Jegantha right back out of the graveyard onto the battlefield for free. Meanwhile, Fervor ensures that Jegantha's return is immediate, granting it the haste it needs to tap right back for the exact five-color mana required to activate Horde of Notions again.