Agatha of the Vile Cauldron + Propagator Drone + Stonework Packbeast

Agatha of the Vile Cauldron

Propagator Drone

Stonework Packbeast

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 Stonework Packbeast by paying 1, adding .
4. Repeat.

This loop relies on Agatha of the Vile Cauldron to drastically slash activation costs based on her power, turning Propagator Drone's token-generation ability into a bargain that costs just green mana. To fuel that discounted ability, Stonework Packbeast steps in as a flexible filter that turns the colorless mana from the sacrificed Eldrazi Spawn into the exact green mana needed to keep the cycle spinning.