Green Goblin, Nemesis, Tortured Existence, Crystalline Crawler, and Leyline of Transformation

Prerequisites

• Green Goblin, Nemesis on the battlefield
• Tortured Existence on the battlefield
• Crystalline Crawler on the battlefield
• Leyline of Transformation on the battlefield
• undefined available

Steps

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

Results

• Infinite self-discard triggers