Activate Ruthless Ripper's morph ability by revealing a black card from your hand, turning it face-up and triggering its ability.
Ruthless Ripper dies as a state-based action due to having zero or less toughness.
Yedora triggers, returning Ruthless Ripper to the battlefield face-down as a Forest land.
Resolve the Ruthless Ripper trigger from step 1, causing target player to lose 2 life.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite green mana

Infinite landfall triggers

Infinite lifeloss

Infinite creature LTB

Yedora, Grave Gardener

Ruthless Ripper

Stronghold Taskmaster

Cast Rot Hulk by paying {5}{B}{B}.
Rot Hulk dies as a state-based action due to having zero toughness.
The Meathook Massacre triggers, causing each opponent to lose 1 life.
Rot Hulk's enter the battlefield trigger is put onto the stack.
Resolve the Rot Hulk trigger, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Rot Hulk

Godhead of Awe

The Meathook Massacre

Cast Rot Hulk by paying {5}{B}{B}.
Rot Hulk dies as a state-based action due to having zero toughness.
Bastion of Remembrance triggers, causing each opponent to lose 1 life and you to gain 1 life.
Rot Hulk's enter the battlefield trigger is put onto the stack.
Resolve the Rot Hulk trigger, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Infinite lifegain

Infinite lifegain triggers

Bastion of Remembrance

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.

Vindictive Lich

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 Tattered Mummy from your graveyard to the battlefield.
Rot Hulk and Tattered Mummy die as a state-based action due to having zero toughness.
The Tattered Mummy and Rot Hulk triggers are put on the stack.
Resolve the Tattered Mummy trigger, causing each opponent to lose 2 life.
Repeat from step 4.

Tattered Mummy

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 Infectious Host from your graveyard to the battlefield.
Rot Hulk and Infectious Host die as a state-based action due to having zero toughness.
The Infectious Host and Rot Hulk triggers are put on the stack.
Resolve the Infectious Host trigger, causing target player to lose 2 life.
Repeat from step 4.

Infectious Host

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.

Combos with "Stronghold Taskmaster"