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 Vindictive Lich from your graveyard to the battlefield.
Rot Hulk and Vindictive Lich die as a state-based action due to having zero toughness.
The Vindictive Lich and Rot Hulk triggers are put on the stack.
Resolve the Vindictive Lich trigger, causing target opponent to lose five life.
Repeat from step 4.

Infinite death triggers

Infinite creature ETB

Infinite lifeloss

Infinite creature LTB

Rot Hulk

Godhead of Awe

Engineered Plague

Vindictive Lich

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 Vindictive Lich from your graveyard to the battlefield.
Rot Hulk and Vindictive Lich die as a state-based action due to having zero toughness.
The Vindictive Lich and Rot Hulk triggers are put on the stack.
Resolve the Vindictive Lich trigger, causing target opponent to lose five life.
Repeat from step 4.

Combos with "Vindictive Lich"