Valkyrie's Call + Amoeboid Changeling + Spawning Pit + Dominating Vampire

Valkyrie's Call

Amoeboid Changeling

Spawning Pit

Dominating Vampire

How it works

1. Activate Amoeboid Changeling's second ability by tapping it, removing all creature types from Dominating Vampire.
2. Activate Spawning Pit by sacrificing Dominating Vampire.
3. When Dominating Vampire dies, Valkyrie's Call triggers, returning Dominating Vampire from your graveyard to the battlefield as an Angel with flying and a +1/+1 counter on it.
4. When Dominating Vampire enters the battlefield, it triggers, untapping Amoeboid Changeling.
5. Resolve the Spawning Pit ability, putting a charge counter on it.
6. Repeat.

This clever loop turns Amoeboid Changeling's ability to strip creature types into a permanent-recycling engine, using Spawning Pit to neatly convert your own creatures into fuel. When you strip away all creature types from Dominating Vampire, its mana value effectively drops to zero, allowing Valkyrie's Call to continuously resurrect it the moment Spawning Pit sends it to the graveyard. Every time Dominating Vampire re-enters the battlefield, its triggered ability conveniently untaps Amoeboid Changeling, resetting your type-stripping engine and leaving you with an ever-growing stockpile of charge counters on Spawning Pit.