Activate Tortured Existence by paying {B} and discarding a creature card.
Green Goblin's first ability triggers, putting a +1/+1 counter on Crystalline Crawler.
Resolve the Tortured Existence ability, returning another creature card from your graveyard to your hand.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding {B}.
Repeat.

Infinite self-discard triggers

Green Goblin, Nemesis

Tortured Existence

Crystalline Crawler

Stalactite Dagger

Maskwood Nexus

Conspiracy

Xenograft

Leyline of Transformation

Arcane Adaptation

Activate Oko's first loyalty ability by putting two loyalty counters on it, causing Crystalline Crawler to gain all creature types.
Activate Tortured Existence by paying {B} and discarding a creature card.
Green Goblin's first ability triggers, putting a +1/+1 counter on Crystalline Crawler.
Resolve the Tortured Existence ability, returning another creature card from your graveyard to your hand.
Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding {B}.
Repeat from step 2.

Oko, Lorwyn Liege // Oko, Shadowmoor Scion

Rukarumel, Biologist

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