Mikaeus, the Unhallowed + Woe Strider + Soulstinger

Mikaeus, the Unhallowed

Woe Strider

Soulstinger

How it works

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

This clever loop harnesses Mikaeus, the Unhallowed to grant the crucial undying ability to non-Human creatures, turning the graveyard into a revolving door. By repeatedly feeding Soulstinger to Woe Strider's sacrifice outlet, you trigger Soulstinger's own entry mechanic to place a self-canceling -1/-1 counter that strips away the +1/+1 counter from undying. This elegant mathematical neutralization allows Soulstinger to die over and over again, generating an endless stream of sacrifice triggers, creature enters-the-battlefield events, and free scry operations.