Agatha of the Vile Cauldron + Propagator Drone + Mycosynth Lattice

Agatha of the Vile Cauldron

Propagator Drone

Mycosynth Lattice

How it works

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

This loop works by leveraging the color-shifting properties of Mycosynth Lattice to transform your entire board into colorless artifacts, allowing Agatha of the Vile Cauldron to aggressively discount the activation cost of Propagator Drone. Because Agatha of the Vile Cauldron reduces activated abilities by her power (effectively turning the drone's normally expensive ability into a cheap repeatable investment), you can pump out endless Eldrazi Spawn tokens for less mana than they produce when sacrificed. Propagator Drone also grants evolve to your tokens along the way, while the resulting loop endlessly feeds your graveyard and triggers every enter-the-battlefield or sacrifice effect you have in play.