Activate Steward of Solidarity by tapping it, creating a 1/1 Warrior token.
Warrior token enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Repeat

Infinite creature tokens

Infinite ETB

Intruder Alarm

Steward of Solidarity

Activate Necrotic Ooze using Steward of Solidarity's ability by tapping and exerting it, creating a 1/1 Warrior creature token.
Activate Necrotic Ooze using Grimgrin's ability by sacrificing the Warrior, untapping Necrotic Ooze and putting a +1/+1 counter on it.
Repeat.

Infinite +1/+1 counters on Necrotic Ooze

Infinite death triggers

Infinite LTB

Infinite sacrifice triggers

Grimgrin, Corpse-Born

Necrotic Ooze

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