Skeleton Ship + Thornbite Staff + Hapatra, Vizier of Poisons

Skeleton Ship

Thornbite Staff

Hapatra, Vizier of Poisons

How it works

1. Activate Skeleton Ship by tapping it, putting a -1/-1 counter on target creature with toughness equal to 1.
2. The creature dies as a state-based action due to having zero or less toughness, triggering Hapatra and Skeleton Ship.
3. Resolve the Hapatra trigger, creating a creature token.
4. Resolve the Skeleton Ship trigger, untapping it.
5. Repeat.