Blightbeetle + Stiltzkin, Moogle Merchant + Phantom Train

Blightbeetle

Stiltzkin, Moogle Merchant

Phantom Train

How it works

1. Donate Blightbeetle to an opponent
2. Activate Phantom Train 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 Phantom Train ability.
5. Repeat from step 2.

This clever loop turns a seemingly harmless interaction into a relentless engine by weaponizing Stiltzkin, Moogle Merchant's ability to trade permanents. By handing over Blightbeetle to your opponent, its passive static ability—which prevents opponents' creatures from ever receiving +1/+1 counters—permanently sabotages your own sacrifices. With that restriction locked in place, feeding creatures to Phantom Train becomes entirely safe from counter accumulation, letting you endlessly feed the Vehicle and grind out infinite death, sacrifice, and entry triggers.