Mikaeus, the Unhallowed + Woe Strider + Obstinate Gargoyle

Mikaeus, the Unhallowed

Woe Strider

Obstinate Gargoyle

How it works

1. Activate Woe Strider by sacrificing Obstinate Gargoyle.
2. When Obstinate Gargoyle 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 Obstinate Gargoyle.
5. When Obstinate Gargoyle 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.