Mikaeus, the Unhallowed + Woe Strider + Putrid Goblin

Mikaeus, the Unhallowed

Woe Strider

Putrid Goblin

How it works

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