Activate Ashnod's Altar by sacrificing Persistent Specimen, adding {C}{C}.
When Persistent Specimen dies, Bhaal triggers, putting a +1/+1 counter on Crystalline Crawler and goading it.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding {B}.
Activate Persistent Specimen by paying {2}{B}, returning it from your graveyard to the battlefield tapped.
Repeat.

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Bhaal, Lord of Murder

Persistent Specimen

Crystalline Crawler

Ashnod's Altar

Activate Phyrexian Altar by sacrificing Persistent Specimen, adding {B}.
When Persistent Specimen dies, Bhaal triggers, putting a +1/+1 counter on Cryptic Trilobite and goading it.
Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding {C}{C} that can only be spent to activate abilities.
Activate Persistent Specimen by paying {2}{B}, returning it from your graveyard to the battlefield tapped.
Repeat.

Cryptic Trilobite

Phyrexian Altar

Activate Persistent Specimen by paying {2}{B}, returning it from your graveyard to the battlefield.
Activate Umbral Collar Zealot by sacrificing Persistent Specimen.
When Persistent Specimen is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler.
Resolve the Umbral Collar Zealot ability.
Activate Crystalline Crawler three times by removing three +1/+1 counters from it, adding {2}{B}.
Repeat.

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