Cast Green Dragon by paying {4}{G}{G}.
Green Dragon enters the battlefield, triggering itself and Warstorm Surge.
Resolve the Green Dragon trigger, causing any creature your opponent control that are dealt damage this turn to be destroyed.
Resolve the Warstorm Surge trigger, dealing damage equal to Green Dragon's power to any creature an opponent controls.
Green Dragon triggers, destroying the creature dealt damage.
The creature dies, triggering Overseer of the Damned's second ability, creating a 2/2 Zombie creature token.
The Zombie enters the battlefield, triggering Warstorm Surge, dealing damage equal to the Zombie's power to any creature an opponent controls.
Repeat from step 5.

Destroy all nontoken creatures opponents control

Near-infinite creature tokens

Near-infinite ETB

Green Dragon

Overseer of the Damned

Warstorm Surge

Cast Green Dragon by paying {4}{G}{G}.
Green Dragon enters the battlefield, triggering itself and Pandemonium.
Resolve the Green Dragon trigger, causing any creature your opponent control that are dealt damage this turn to be destroyed.
Resolve the Pandemonium trigger, dealing damage equal to Green Dragon's power to any creature an opponent controls.
Green Dragon triggers, destroying the creature dealt damage.
The creature dies, triggering Overseer of the Damned's second ability, creating a 2/2 Zombie creature token.
The Zombie enters the battlefield, triggering Pandemonium, dealing damage equal to the Zombie's power to any creature an opponent controls.
Repeat from step 5.

Pandemonium

Cast Green Dragon by paying {4}{G}{G}.
Green Dragon enters the battlefield, triggering itself and Terror of the Peaks.
Resolve the Green Dragon trigger, causing any creature your opponent control that are dealt damage this turn to be destroyed.
Resolve the Terror of the Peaks trigger, dealing damage equal to Green Dragon's power to any creature an opponent controls.
Green Dragon triggers, destroying the creature dealt damage.
The creature dies, triggering Overseer of the Damned's second ability, creating a 2/2 Zombie creature token.
The Zombie enters the battlefield, triggering Terror of the Peaks, dealing damage equal to the Zombie's power to any creature an opponent controls.
Repeat from step 5.

Terror of the Peaks

Activate Tortured Existence by paying {B} and discarding Dryad Arbor.
Green Goblin's second ability triggers, creating a tapped Treasure token.
When the Treasure enters the battlefield, Amulet of Vigor triggers, untapping the Treasure.
Resolve the Tortured Existence ability, returning another creature card from your graveyard to your hand.
Activate the Treasure by tapping and sacrificing it, adding {B}{B}.
Activate Tortured Existence by paying {B} and discarding a creature card.
Green Goblin's first ability triggers, putting a +1/+1 counter on a Goblin you control.
Resolve the Tortured Existence ability, returning Dryad Arbor from your graveyard to your hand.
Repeat.

Infinite self-discard triggers

Infinite +1/+1 counters on Goblins you control

Green Goblin, Nemesis

Dryad Arbor

Tortured Existence

Amulet of Vigor

Goldspan Dragon

Activate Tortured Existence by paying {B} and discarding Dryad Arbor.
Green Goblin's second ability triggers, creating an untapped Treasure token due to Archelos.
Resolve the Tortured Existence ability, returning another creature card from your graveyard to your hand.
Activate the Treasure by tapping and sacrificing it, adding {B}{B}.
Activate Tortured Existence by paying {B} and discarding a creature card.
Green Goblin's first ability triggers, putting a +1/+1 counter on a Goblin you control.
Resolve the Tortured Existence ability, returning Dryad Arbor from your graveyard to your hand.
Repeat.

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