Cast Gnarled Scarhide by paying {0} due to Ragemonger.
When Gnarled Scarhide enters the battlefield, Sethron and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
Resolve the Sethron trigger, creating a 2/3 Minotaur creature token.
When the Minotaur token enters the battlefield, Cloudstone Curio triggers, returning Gnarled Scarhide to your hand from the battlefield.
Repeat.

Infinite creature tokens

Infinite ETB

Infinite LTB

Infinite storm count

Sethron, Hurloon General

Cloudstone Curio

Ragemonger

Gnarled Scarhide

Cast Gnarled Scarhide by paying {B}.
Gnarled Scarhide enters the battlefield, triggering Cloudstone Curio and Sethron.
Resolve the Cloudstone Curio trigger, choosing to return nothing from the battlefield to your hand.
Resolve the Sethron trigger, creating a 2/2 Minotaur creature token.
The Minotaur enters the battlefield, triggering Cloudstone Curio, returning Gnarled Scarhide from the battlefield to your hand.
Activate Phyrexian Altar by sacrificing the Minotaur token, adding {B}.
Repeat.

Infinite death triggers

Infinite sacrifice triggers

Phyrexian Altar

Cast Hateful Eidolon by paying {B}.
Tatsunari triggers, creating a 3/3 Keimi legendary creature token.
Keimi enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning nothing from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Hateful Eidolon enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning Gnarled Scarhide from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Cast Gnarled Scarhide by paying {B}.
Keimi triggers, causing each opponent to lose 1 life and you to gain 1 life.
Gnarled Scarhide enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning Hateful Eidolon from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Cast Hateful Eidolon by paying {B}.
Keimi triggers, causing each opponent to lose 1 life and you to gain 1 life.
Repeat from step 6.

Infinite lifegain triggers

Infinite lifeloss

Tatsunari, Toad Rider

Carnival of Souls

Hateful Eidolon

Cast Dockside Chef by paying {B}.
Tatsunari triggers, creating a 3/3 Keimi legendary creature token.
Keimi enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning nothing from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Dockside Chef enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning Gnarled Scarhide from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Cast Gnarled Scarhide by paying {B}.
Keimi triggers, causing each opponent to lose 1 life and you to gain 1 life.
Gnarled Scarhide enters the battlefield, triggering Cloudstone Curio and Carnival of Souls.
Resolve the Cloudstone Curio trigger, returning Dockside Chef from the battlefield to your hand.
Resolve the Carnival of Souls trigger, causing you to lose 1 life and add {B}.
Cast Dockside Chef by paying {B}.
Keimi triggers, causing each opponent to lose 1 life and you to gain 1 life.
Repeat from step 6.

Dockside Chef

Activate Phyrexian Altar by sacrificing Gnarled Scarhide, adding {B}.
When Gnarled Scarhide dies, Mortuary and Ashiok's Reaper trigger.
Resolve the Mortuary trigger, putting Gnarled Scarhide on top of your library from your graveyard.
Resolve the Ashiok's Render trigger, causing you to draw Gnarled Scarhide from your library.
Cast Gnarled Scarhide by paying {B}.
Repeat.

Infinite draw triggers

Ashiok's Reaper

Mortuary

Combos with "Gnarled Scarhide"