Mikaeus, the Unhallowed + Blue, Loyal Raptor + Bartolomé del Presidio

Mikaeus, the Unhallowed

Blue, Loyal Raptor

Bartolomé del Presidio

How it works

1. Activate Bartolomé del Presidio by sacrificing the other Dinosaur.
2. When the Dinosaur dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to the -1/-1 counter it will gain from Blue.
3. Resolve the Bartolomé del Presidio ability.
4. Repeat.

This engine relies on Mikaeus, the Unhallowed to grant undying to your non-Human creatures, turning any suitable sacrifice target into an endless loop when combined with a sacrifice outlet like Bartolomé del Presidio. To make this work with a Dinosaur, Blue, Loyal Raptor steps in: its passive ability ensures that any kind of counter on Blue is also placed on your other entering Dinosaurs. By utilizing a counter type that offsets the +1/+1 counter from undying—specifically a -1/-1 counter—the Dinosaur returns without a +1/+1 counter, allowing undying to trigger again indefinitely.