Cast Sidisi by paying its mana cost.
When Sidisi enters, it triggers, causing you to sacrifice it.
When Sidisi dies, it and Ratadrabik trigger.
Resolve the Sidisi trigger, allowing you to tutor a card to your hand.
Resolve the Ratadrabik trigger, creating a token copy of Sidisi that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Sidisi token instead.

Infinite creature ETB

Infinite creature LTB

Infinite card draw

Infinite death triggers

Infinite creature sacrifice triggers

Ratadrabik of Urborg

Leyline of Singularity

Sidisi, Undead Vizier

Cast Phyrexian Dreadnought by paying its mana cost.
When Phyrexian Dreadnought enters, it triggers, causing you to sacrifice it.
When Phyrexian Dreadnought dies, Ratadrabik triggers, creating a token copy of Phyrexian Dreadnought that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Phyrexian Dreadnought token instead.

Phyrexian Dreadnought

Cast Repository Skaab by paying its mana cost.
When Repository Skaab enters, its exploit ability triggers, causing you to sacrifice it.
When Repository Skaab exploits itself, its last ability and Ratadrabik trigger.
Resolve the Repository Skaab trigger, returning target instant or sorcery card from your graveyard to your hand. 
Resolve the Ratadrabik trigger, creating a token copy of Repository Skaab that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Repository Skaab token instead.

Return all instant and sorcery cards from your graveyard to your hand

Repository Skaab

Cast Rot-Tide Gargantua by paying its mana cost.
When Rot-Tide Gargantua enters, its exploit ability triggers, causing you to sacrifice it.
When Rot-Tide Gargantua dies, its second ability and Ratadrabik trigger.
Resolve the Rot-Tide Gargantua trigger, causing each opponent to sacrifice a creature.
Resolve the Ratadrabik trigger, creating a token copy of Rot-Tide Gargantua that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Rot-Tide Gargantua token instead.

Each opponent sacrifices all creatures they control

Rot-Tide Gargantua

Cast Ravenous Rotbelly by paying its mana cost.
When Ravenous Rotbelly enters, it triggers, causing you to sacrifice it and each opponent to sacrifice a creature.
When Ravenous Rotbelly dies, Ratadrabik triggers, creating a token copy of Ravenous Rotbelly that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Ravenous Rotbelly token instead.

Ravenous Rotbelly

Cast Accursed Centaur by paying its mana cost.
When Accursed Centaur enters, it triggers, causing you to sacrifice it.
When Accursed Centaur dies, Ratadrabik triggers, creating a token copy of Accursed Centaur that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Accursed Centaur token instead.

Accursed Centaur

Cast Fleshbag Marauder by paying its mana cost.
When Fleshbag Marauder enters, it triggers, causing you to sacrifice it.
When Fleshbag Marauder dies, Ratadrabik triggers, creating a token copy of Fleshbag Marauder that is a 2/2 legendary Zombie in addition to its other types.
Repeat from step 2 using the Fleshbag Marauder token instead.

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