Agatha's Soul Cauldron + Neerdiv, Devious Diver + Fatestitcher

Agatha's Soul Cauldron

Neerdiv, Devious Diver

Fatestitcher

How it works

1. Activate a creature using Fatestitcher's ability by tapping it, untapping Neerdiv.
2. Activate Neerdiv using Fatestitcher's ability by tapping it.
3. Neerdiv triggers, causing a player to mill cards equal to its power.
4. Resolve the Neerdiv ability from step 2, untapping another creature.
5. Repeat.