Mikaeus, the Unhallowed + Woe Strider + Plague Belcher

Mikaeus, the Unhallowed

Woe Strider

Plague Belcher

How it works

1. Activate Woe Strider by sacrificing Plague Belcher.
2. When Plague Belcher dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Plague Belcher enters the battlefield, it triggers, putting a -1/-1 counter on it.
4. Resolve the Woe Strider ability
5. Repeat.