Mikaeus, the Unhallowed + Wingrattle Scarecrow + Carrion Feeder

Mikaeus, the Unhallowed

Wingrattle Scarecrow

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing Wingrattle Scarecrow.
2. When Wingrattle Scarecrow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Resolve the Carrion Feeder ability.
4. Activate Carrion Feeder by sacrificing Wingrattle Scarecrow.
5. When Wingrattle Scarecrow dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Carrion Feeder ability.
7. Repeat.