Jegantha, the Wellspring + Horde of Notions + The Fire Crystal + Phantom Train

Jegantha, the Wellspring

Horde of Notions

The Fire Crystal

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 clever loop relies on Horde of Notions and its ability to pull elementals straight from your graveyard, utilizing Jegantha, the Wellspring as the recursive sacrifice fodder. By tapping Jegantha for its color-restricted mana, you can feed Phantom Train to animate the Train while boosting it with a +1/+1 counter and sending Jegantha to the graveyard. Horde of Notions then uses that exact colored mana to replay Jegantha for free, resetting the cycle while The Fire Crystal passively grants your creatures haste so everything is ready to go right away.