Blightbeetle + Wrong Turn + Carrion Feeder

Blightbeetle

Wrong Turn

Carrion Feeder

How it works

1. Donate Blightbeetle to an opponent
2. Activate Carrion Feeder by sacrificing the undying creature.
3. When the undying creature dies, its undying ability triggers, returning itself from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle.
4. Resolve the Carrion Feeder ability.
5. Repeat from step 2.

This clever loop relies on turning Blightbeetle's passive hate into an engine piece by using Wrong Turn to hand it over to your opponent, completely shutting down their ability to place +1/+1 counters. With that restriction in place on the opposing side, you can repeatedly feed a creature to Carrion Feeder and abuse any undying trigger; because Blightbeetle prevents counters from being placed on your opponent's creatures, that creature will return to the battlefield fresh every single time. It's a brilliantly asymmetrical setup that transforms an opponent's natural defensive roadblock into an endless sacrifice loop!