Cast Rot Hulk by paying {5}{B}{B}.
Rot Hulk dies as a state-based action due to having zero toughness.
Rot Hulk's enter the battlefield trigger is put onto the stack.
Resolve the Rot Hulk trigger, returning Rot Hulk and Vengeful Dead from your graveyard to the battlefield.
Rot Hulk and Vengeful Dead die as a state-based action due to having zero toughness.
The Vengeful Dead and Rot Hulk triggers are put on the stack.
Resolve the Vengeful Dead trigger, causing each opponent to lose 1 life.
Repeat from step 4.

Infinite death triggers

Infinite creature ETB

Infinite lifeloss

Infinite creature LTB

Rot Hulk

Godhead of Awe

Engineered Plague

Vengeful Dead

Cast Rot Hulk by paying {3}{B}{B}.
Rot Hulk dies as a state-based action due to having zero toughness.
Rot Hulk's enter the battlefield trigger is put onto the stack.
Resolve the Rot Hulk trigger, returning Rot Hulk and Vengeful Dead from your graveyard to the battlefield.
Rot Hulk and Vengeful Dead die as a state-based action due to having zero toughness.
The Vengeful Dead and Rot Hulk triggers are put on the stack.
Resolve the Vengeful Dead trigger, causing each opponent to lose 1 life.
Repeat from step 4.

Combos with "Vengeful Dead"