Mikaeus, the Unhallowed + Carrion Feeder + Rendclaw Trow

Mikaeus, the Unhallowed

Carrion Feeder

Rendclaw Trow

How it works

1. Activate Carrion Feeder by sacrificing Rendclaw Trow.
2. When Rendclaw Trow 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 Rendclaw Trow.
5. When Rendclaw Trow 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.