Blightbeetle + Mikaeus, the Unhallowed + Goblin Sharpshooter + Iroh, Tea Master

Blightbeetle

Mikaeus, the Unhallowed

Goblin Sharpshooter

Iroh, Tea Master

How it works

1. Give control of Blightbeetle to an opponent, if needed. Also, give Goblin Sharpshooter deathtouch, if needed.
2. Activate Goblin Sharpshooter by tapping it, dealing 1 damage to the additional creature and destroying it due to Goblin Sharpshooter's deathtouch.
3. When the creature dies, its undying ability and Goblin Sharpshooter trigger.
4. Resolve the creature's undying trigger, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to Blightbeetle.
5. Resolve the Goblin Sharpshooter trigger, untapping it.
6. Repeat from step 2.