Blightbeetle + Goblin Bombardment + Coveted Falcon

Blightbeetle

Goblin Bombardment

Coveted Falcon

How it works

1. Activate Coveted Falcon by paying 1, turning it face up.
2. Coveted Falcon triggers, causing an opponent to gain control of Blightbeetle and causing you to draw a card.
3. Activate Goblin Bombardment by sacrificing the undying creature.
4. 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.
5. Resolve the Goblin Bombardment ability.
6. Repeat from step 3.

This clever engine turns a clever rules interaction into an infinite damage loop by exploiting how replacement effects interact with sacrifice and zone changes. While Goblin Bombardment provides the sacrifice outlet to constantly deal damage and trigger deaths, Blightbeetle serves as the critical linchpin—its static ability prevents any +1/+1 counters from being placed on your opponents' creatures, which magically bypasses undying's usual counter restriction when an undying creature returns to the battlefield under your opponent's control. To keep this loop functional across the battlefield, Coveted Falcon's disguise flip safely hands Blightbeetle over to your opponent while drawing you a card, ensuring your sacrificed creatures always come back fresh and ready to be fed right back into the fire.