Blightbeetle + Carrion Feeder + Donate

Blightbeetle

Carrion Feeder

Donate

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 cunning loop turns your opponent's own security blanket against them by using Donate to hand over Blightbeetle, locking down their ability to receive +1/+1 counters. With that restriction active on their side of the board, your undying creature can return from the graveyard completely unburdened by those counters whenever it hits the dirt. You then feed that creature to Carrion Feeder, setting off an endless engine of sacrifices, enters-the-battlefield events, and leaves-the-battlefield triggers while stacking infinite +1/+1 counters squarely on your hungry zombie.