Jegantha, the Wellspring + Horde of Notions + Phantom Train + Frostcliff Siege

Jegantha, the Wellspring

Horde of Notions

Phantom Train

Frostcliff Siege

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 engine relies on Jegantha, the Wellspring generating the exact five-color mana requirement for Horde of Notions, which then plucks Jegantha straight back out of the graveyard to repeat the loop. To make this sacrifice cycle work, Phantom Train acts as the necessary outlet, devouring Jegantha while permanently growing its own size with +1/+1 counters. Meanwhile, Frostcliff Siege ties the entire battlefield together by granting its Temur buff of +1/+0, trample, and haste, or drawing you cards through Jeskai whenever your creatures deal combat damage.