Jegantha, the Wellspring + Horde of Notions + Purphoros, Bronze-Blooded + Phantom Train

Jegantha, the Wellspring

Horde of Notions

Purphoros, Bronze-Blooded

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 centers around Phantom Train, which gladly consumes Jegantha, the Wellspring as a sacrifice to fuel its ability and grow with a +1/+1 counter. Once Jegantha rests in your graveyard, Horde of Notions steps in to cast it right back onto the battlefield for free, utilizing the exact five-color mana production of Jegantha, the Wellspring itself to pay the activation cost. Meanwhile, Purphoros, Bronze-Blooded stands ready to grant haste across your board if needed, while ensuring every iteration of this cycle triggers an infinite cascade of deaths, sacrifices, and enters-the-battlefield events.