Color Identity: U

Initial Card State
- Kelpie Guide in exile (exiled by Agatha's Soul Cauldron).
- Agatha's Soul Cauldron and Neerdiv on the battlefield.
Easy Prerequisites
- Neerdiv has a +1/+1 counter on it.
- Neerdiv, Devious Diver does not have summoning sickness.
Notable Prerequisites
- You control another creature that does not have summoning sickness and that has a +1/+1 counter on it.
Steps
- Activate a creature using Kelpie Guide's ability by tapping it, untapping Neerdiv.
- Activate Neerdiv using Kelpie Guide's ability by tapping it.
- Neerdiv triggers, causing a player to mill cards equal to its power.
- Resolve the Neerdiv ability from step 2, untapping another creature.
- Repeat.
Results
- Infinite mill.
- Infinite self-mill.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).