Activate Ashnod's Altar by sacrificing Marionette Master, adding {C}{C}.
When Marionette Master dies, Nim Deathmantle triggers, causing you to pay {4} to return Marionette Master from your graveyard to the battlefield and attach Nim Deathmantle to it.
When Marionette Master enters, it triggers, creating three creature tokens.
Activate Ashnod's Altar by sacrificing a creature token, adding {C}{C}.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite lifeloss

Nim Deathmantle

Ashnod's Altar

Marionette Master

Activate Eldrazi Displacer by paying {2}{C}, blinking Marionette Master.
When Marionette Master enters the battlefield, its fabricate ability triggers, creating three 1/1 Servo artifact creature tokens.
Activate Ashnod's Altar twice by sacrificing two Servos, adding {C}{C}{C}{C}.
When the tokens die, Marionette Master triggers twice, causing target opponent to lose life equal to twice Marionette Master's power.
Repeat.

Infinite blinking

Infinite colorless mana

Infinite creature tokens

Infinite blinking of most creatures

Eldrazi Displacer

Activate Eldrazi Displacer by paying {2}{C}, blinking Marionette Master.
When Marionette Master enters the battlefield, its fabricate ability triggers, creating three 1/1 Servo artifact creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing two Servos, adding {C}{C}{C}{C}.
When the tokens die, Marionette Master triggers twice, causing target opponent to lose life equal to twice Marionette Master's power.
Repeat.

Krark-Clan Ironworks

Activate Viscera Seer by sacrificing Marionette Master.
When Marionette Master dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Marionette Master enters, its fabricate ability triggers, putting a +1/+1 counter on it.
Resolve the Viscera Seer ability.
Repeat.

Infinite scry 1

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Viscera Seer

Activate Emiel the Blessed by paying {3}, blinking Marionette Master.
When Marionette Master enters the battlefield, its fabricate ability triggers, creating three 1/1 Servo artifact creature tokens.
Activate Krark-Clan Ironworks twice by sacrificing two Servos, adding {C}{C}{C}{C}.
When the tokens die, Marionette Master triggers twice, causing target opponent to lose life equal to twice Marionette Master's power.
Repeat.

Emiel the Blessed

Activate Emiel the Blessed by paying {3}, blinking Marionette Master.
When Marionette Master enters the battlefield, its fabricate ability triggers, creating three 1/1 Servo artifact creature tokens.
Activate Ashnod's Altar twice by sacrificing two Servos, adding {C}{C}{C}{C}.
When the tokens die, Marionette Master triggers twice, causing target opponent to lose life equal to twice Marionette Master's power.
Repeat.

During your upkeep, activate Necrotic Ooze using Whisper's ability by tapping it and sacrificing two other creatures, returning Marionette Master from your graveyard to the battlefield.
Marionette Master enters the battlefield, creating three 1/1 Servo artifact creature tokens.
Activate Necrotic Ooze using Black Carriage's ability by sacrificing Marionette Master, untapping Necrotic Ooze.
Repeat an arbitrarily large number of times.
With Marionette Master on the battlefield, activate Necrotic Ooze using Black Carriage's ability by sacrificing a Servo, untapping Necrotic Ooze.
The Servo dies, triggering Marionette Master, causing each opponent to lose life equal to Marionette Master's power.
Repeat from step 5.

Return all creature cards from your graveyard to the battlefield

Whisper, Blood Liturgist

Necrotic Ooze

Black Carriage

Tap Necrotic Ooze using Whisper, Blood Liturgist's ability to sacrifice two creatures and return Abhorrent Overlord to battlefield.
Abhorrent Overlord's ETB triggers, creating at least 5 creature tokens.
Using Altar Golem's ability, tap Abhorrent Overlord and 4 tokens to untap Necrotic Ooze.
Tap Necrotic Ooze and sacrifice Abhorrent Overlord and a tapped token to Whisper's ability to return Marionetter Master to the battlefield, creating 3 Servo tokens.
Tap Marionette Master and the 4 untapped tokens to untap Necrotic Ooze.
Sacrifice Marionetter Master and a Servo token, causing target opponent to lose 1 life and reanimating Abhorrent Overlord.
Repeat from step 2 for infinite life loss.

Infinite tapped creature tokens

Altar Golem

Abhorrent Overlord

Activate Cauldron of Essence by paying {1}{B}{G}, tapping it and sacrificing another creature.
When the creature dies, Cauldron of Essence triggers, and Dross Scorpion triggers if the creature was an artifact.
Resolve the Cauldron of Essence trigger, causing you to gain 1 life and each opponent to lose 1 life.
Resolve the Dross Scorpion trigger, if applicable, untapping an artifact.
Resolve the Cauldron of Essence ability from step 1, returning Marionette Master from your graveyard to the battlefield.
When Marionette Master enters, it triggers, creating three creature tokens.
Activate Phyrexian Altar three times by sacrificing Marionette Master and two tokens, adding {1}{B}{G}.
When Marionette Master and the tokens die, Dross Scorpion triggers three times, untapping Cauldron of Essence and two other artifacts.
Repeat.

Combos with "Marionette Master"