Get Protean Hulk killed, triggering its ability.
Get Body Snatcher, Carrion Feeder, and Gravecrawler.
With Body Snatcher's ETB trigger on the stack, sacrifice it to Carrion Feeder, getting back Protean Hulk for its death trigger.
Sacrifice Hulk to Carrion Feeder, triggering its ability.
Get Pitiless Plunderer and Blood Artist.
Sacrifice Gravecrawler to Carrion Feeder, giving it a +1/+1 counter, pinging an opponent with Blood Artist, and creating a treasure token.
Cast Gravecrawler from your graveyard using the created treasure token.
Repeat steps 6 and 7 to ping your opponent to death.

Infinite +1/+1 counters on Carrion Feeder

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Protean Hulk

Carrion Feeder

Pitiless Plunderer

Blood Artist

Gravecrawler

Body Snatcher

Get Protean Hulk killed, triggering its ability.
Get Body Snatcher and Viscera Seer.
With Body Snatcher's ETB trigger on the stack, sacrifice it to Viscera Seer, getting back Protean Hulk for its death trigger.
Sacrifice Hulk to Viscera Seer, triggering its ability.
Get Murderous Redcap and Melira.
Murderous Redcap ETB ability triggers, dealing 2 damage to an opponent.
Sacrifice Murderous Redcap to Viscera Seer, bringing it back with persist.
Melira prevents a -1/-1 counter from being put on Murderous Redcap.
Repeat.

Infinite damage

Infinite scry

Viscera Seer

Murderous Redcap

Melira, Sylvok Outcast

Sacrifice Protean Hulk to Varolz's regenerate ability.
Protean Hulk's ability activates, placing Melira, Wingrattle Scarecrow, and Disciple of the Vault on the battlefield.
Sacrifice Wingrattle Scarecrow to Varolz's regenerate ability, triggering Disciple of the Vault's ability and causing an opponent to lose 1 life.
Wingrattle Scarecrow's persist ability activates, bringing it back to the battlefield without a -1/-1 counter due to Melira's ability.
Repeat.

Infinite lifeloss

Varolz, the Scar-Striped

Disciple of the Vault

Wingrattle Scarecrow

Cause Protean Hulk to die.
Protean Hulk triggers, searching your library for Lesser Masticore, Reckles Fireweaver, and Arcbound Ravager, and then putting them onto the battlefield.
Activate Arcbound Ravager by sacrificing Lesser Masticore.
Lesser Masticore triggers, returning itself to the battlefield.
Reckless Fireweaver triggers, dealing 1 damage to each opponent.
Resolve the Arcbound Ravager ability, putting a +1/+1 counter on it.
Repeat from step 3.

Grumgully, the Generous

Lesser Masticore

Reckless Fireweaver

Arcbound Ravager

Get Protean Hulk killed, triggering its ability.
Get Phyrexian Delver and Carrion Feeder.
Phyrexian Delver ETB triggers, bring back Protean Hulk to play.
Sacrifice Protean Hulk to Carrion Feeder, triggering it's ability.
Get Body Snatcher and Blood Artist.
Body Snatcher ETB triggers, hold priority and sacrifice it to Carrion Feeder, triggering its death trigger.
Bring back Protean Hulk to play, Body Snatcher ETB resolves.
Sacrifice Protean Hulk to Carrion Feeder, triggering it's ability.
Get Renegade Rallier and Saffi Eriksdotter.
Use Saffi's ability, sacrificing itself, targeting Renegade Rallier.
Sacrifice Renegade Rallier to Carrion Feeder, triggering Blood Artist to ping an opponent.
Renegade Rallier returns to the battlefield from Saffi's delayed trigger.
Using Renegade Rallier's ETB ability, target Saffi and return Saffi to play.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Phyrexian Delver

Saffi Eriksdotter

Renegade Rallier

Cast Clone by paying {3}{U}, choosing to have it enter the battlefield as a copy of Protean Hulk.
Put Clone into your graveyard due to the legend rule.
Clone dies, causing you to search your library for Loaming Shaman and Phantasmal Image and put them onto the battlefield.
Choose to have Phantasmal Image enter the battlefield as a copy of Protean Hulk.
Put Phantasmal Image into your graveyard due to the legend rule.
Phantasmal Image and Loaming Shaman trigger.
Resolve the Loaming Shaman trigger, shuffling Clone and Phantasmal Image from your graveyard into your library.
Resolve the Protean Hulk trigger, causing you to search your library for Clone and Phantasmal Image and put them onto the battlefield.
Choose to have Clone enter the battlefield as a copy of Loaming Shaman, and Phantasmal Image as a copy of Protean Hulk.
Put Clone and Phantasmal Image into your graveyard due to the legend rule.
Phantasmal Image and Clone trigger.
Resolve the Clone trigger, shuffling Clone and Phantasmal Image from your graveyard into your library.
Resolve the Phantasmal Image trigger, causing you to search your library for Clone and Phantasmal Image and put them onto the battlefield.
Repeat from step 9.

Loaming Shaman

Leyline of Singularity

Clone

Phantasmal Image

Combos with "Protean Hulk"