Activate Ashnod's Altar by sacrificing Puppeteer Clique, adding {C}{C}.
Puppeteer Clique dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Puppeteer Clique enters the battlefield, putting any creature card from an opponent's graveyard onto the battlefield under your control.
Activate Fain's second ability by tapping it and removing the -1/-1 counter from Puppeteer Clique, creating a Treasure token.
Activate the Treasure token by tapping and sacrificing it, adding {B}.
Activate Ashnod's Altar by sacrificing the creature your opponent owns, adding {C}{C}.
Activate Fain's fourth ability by paying {3}{B}, untapping it.
Repeat.

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Fain, the Broker

Puppeteer Clique

Ashnod's Altar

Cast Spark Double, choosing to have it enter as a copy of Puppeteer Clique.
Resolve its ETB trigger.
Sacrifice it to Altar of Dementia targeting an opponent.
Persist triggers, returning Spark Double with a -1/-1 counter, which is removed because of the +1/+1 counter that Spark Double enters with.
Repeat to get every creature out of each opponent library and mill them all out.

Infinite mill

Spark Double

Altar of Dementia

Activate Ashnod's Altar by sacrificing Puppeteer Clique, adding {C}{C}.
Puppeteer Clique dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Puppeteer Clique enters the battllefield, putting a creature card from an opponent's graveyard onto the battlefield under your control.
Activate Ghave's second ability by paying {1} and sacrificing the creature your opponent owns, putting a +1/+1 counter on Puppeteer Clique.
Repeat.

Ghave, Guru of Spores

Activate Phyrexian Altar by sacrificing Puppeteer Clique, adding {1}.
Puppeteer Clique dies, triggering its persist ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Puppeteer Clique enters the battllefield, putting a creature card from an opponent's graveyard onto the battlefield under your control.
Activate Ghave's second ability by paying {1} and sacrificing the creature your opponent owns, putting a +1/+1 counter on Puppeteer Clique.
Repeat.

Phyrexian Altar

Activate Phyrexian Altar by sacrificing Puppeteer Clique, adding {B/G}.
When Puppeteer Clique dies, its persist ability triggers, returning it to the battlefield from your graveyard with a -1/-1 counter on it.
When Puppeteer Clique enters the battlefield, it triggers, putting target creature card from an opponent's graveyard onto the battlefield under your control.
Activate Quillspike by paying {B/G} and removing the -1/-1 counter from Puppeteer Clique, giving Quillspike +3/+3 until end of turn.
Repeat.
You may also sacrifice the creature put under your control by Puppeteer Clique during each iteration to get infinite colored mana.

Infinite colored mana

Infinitely large creature until end of turn

Return all creature cards from each opponent's graveyard to the battlefield under your control

Quillspike

Activate Ashnod's Altar by sacrificing Puppeteer Clique, adding {C}{C}.
Puppeteer Clique dies, triggering its persist ability and Blade of the Bloodchief.
Resolve the Puppeteer Clique trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Puppeteer Clique enters the battlefield, putting target creature from an opponent's graveyard onto the battlefield under your control until end of turn.
Resolve the Blade of the Bloodchief trigger, putting a +1/+1 counter on Putrid Goblin.
Equip Blade of the Bloodchief to Puppeteer Clique by paying {1}.
Activate Ashnod's Altar by sacrificing Putrid Goblin, adding {C}{C}.
Putrid Goblin dies, triggering its persist ability and Blade of the Bloodchief.
Resolve Putrid Goblin's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Blade of the Bloodchief trigger, putting a +1/+1 counter on Puppeteer Clique.
Equip Blade of the Bloodchief to Putrid Goblin by paying {1}.
Repeat.

Blade of the Bloodchief

Putrid Goblin

Activate Viscera Seer by sacrificing Puppeteer Clique.
When Puppeteer Clique dies, its persist ability and Szarel trigger.
Resolve the persist trigger, returning Puppeteer Clique from your graveyard to the battlefield with a -1/-1 counter on it.
When Puppeteer Clique enters, it triggers, putting a creature card from an opponent's graveyard onto the battlefield under your control.
Resolve the Szarel trigger, putting a number of +1/+1 counters on another creature you control.
Resolve the Viscera Seer ability from step 1.
Activate Viscera Seer by sacrificing the creature returned in step 4.
When the creature dies, Szarel triggers, putting a number of +1/+1 counters on Puppeteer Clique.
Resolve the Viscera Seer ability.
Repeat.

Infinite scry 1

Infinite +1/+1 counters on creatures you control

Szarel, Genesis Shepherd

Viscera Seer

Activate Phyrexian Altar by sacrificing Puppeteer Clique, adding one mana of any color.
Puppeteer Clique dies, triggering its persist ability and Blade of the Bloodchief.
Resolve the Puppeteer Clique trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Puppeteer Clique enters the battlefield, putting target creature from an opponent's graveyard onto the battlefield under your control until end of turn.
Resolve the Blade of the Bloodchief trigger, putting a +1/+1 counter on Murderous Redcap.
Equip Blade of the Bloodchief to Puppeteer Clique by paying {1}.
Activate Phyrexian Altar by sacrificing Murderous Redcap, adding one mana of any color.
Murderous Redcap dies, triggering its persist ability and Blade of the Bloodchief.
Resolve Murderous Redcap's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Murderous Redcap enters the battlefield, dealing damage equal to its power to any target.
Resolve the Blade of the Bloodchief trigger, putting a +1/+1 counter on Puppeteer Clique.
Equip Blade of the Bloodchief to Murderous Redcap by paying {1}.
Repeat.

Combos with "Puppeteer Clique"