Reveillark + Activated Sleeper + Carrion Feeder

Reveillark

Activated Sleeper

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Reveillark.
2. When Reveillark dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Reveillark.
3. Activate Carrion Feeder by sacrificing Activated Sleeper.
4. When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Reveillark.
5. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
6. Repeat from step 3.

This elegant loop turns the graveyard into a revolving door by leveraging Reveillark's leaves-the-battlefield trigger to continuously resurrect fallen threats. The secret sauce is Activated Sleeper, whose flash and copy abilities let it sneak onto the battlefield directly as a fresh copy of Reveillark whenever a creature dies, sustaining the cycle. Meanwhile, Carrion Feeder acts as the designated executioner, providing a free, instant-speed sacrifice outlet that instantly triggers Reveillark and Activated Sleeper's recursion while growing infinitely large in the process.