Agatha of the Vile Cauldron + Propagator Drone + Crossroads Candleguide

Agatha of the Vile Cauldron

Propagator Drone

Crossroads Candleguide

How it works

1. Activate Propagator Drone by paying , creating a 0/1 Eldrazi Spawn creature token.
2. Activate the Eldrazi Spawn by sacrificing it, adding C.
3. Activate Crossroads Candleguide by paying 1, adding .
4. Repeat.

This clever loop relies on Agatha of the Vile Cauldron's cost reduction to turn Propagator Drone's token-making ability into an engine that pays for itself. With Agatha's discount active, Propagator Drone only requires {G} to activate, which is precisely the amount of mana generated when you sacrifice the resulting Eldrazi Spawn. To bridge the color requirements, Crossroads Candleguide steps in by filtering that colorless mana into the green mana needed to keep the cycle going.