Mikaeus, the Unhallowed + Viscera Seer + Pith Driller

Mikaeus, the Unhallowed

Viscera Seer

Pith Driller

How it works

1. Activate Viscera Seer by sacrifiicing Pith Driller.
2. When Pith Driller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it.
4. Resolve the Viscera Seer ability, causing you to scry 1.
5. Repeat.

This elegant loop relies on Mikaeus, the Unhallowed to grant undying to your non-Human creatures, turning any suitable sacrifice victim into a persistent engine. By feeding Pith Driller to Viscera Seer, you trigger the Driller's undying ability to return it to the battlefield with a +1/+1 counter. At the same time, Pith Driller's own entry trigger targets itself with a -1/-1 counter, which instantly neutralizes the existing +1/+1 counter through state-based actions. This leaves the Driller completely clean of counters and ready to be sacrificed to Viscera Seer all over again, generating an endless supply of sacrifices, enter-the-battlefield events, and scry digging.