Cast Rot-Tide Gargantua either from your hand or from the top of your library by paying {0}.
When Rot-Tide Gargantua enters the battlefield, its exploit ability triggers, causing you to sacrifice it.
When Rot-Tide Gargantua dies, Mortuary triggers, putting it on top of your library from your graveyard.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Rooftop Storm

Mortuary

Realmwalker

Rot-Tide Gargantua

Cast Rot-Tide Gargantua by paying {0}.
When Rot-Tide Gargantua enters the battlefield, it triggers, causing you to sacrifice it.
When Rot-Tide Gargantua dies, Enduring Renewal triggers, returning it to your hand from your graveyard.
Repeat.

Enduring Renewal

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