Cast Massacre Wurm by paying {3}{B}{B}{B}.
When Massacre Wurm enters, it's first ability triggers, giving all opposing creatures -2/-2 until end of turn.
All of your opponents' lands die as a state-based action due to having zero or less toughness, as they are creatures due to Natural Affinity.
When the lands die, Massacre Wurm's second ability triggers for each land that dies this way, causing each opponent to lose 2 life for each land that died under their control.

Near-infinite lifeloss

Destroy all lands opponents control

Mass Land Denial

Massacre Wurm

Natural Affinity

Cast Massacre Wurm by paying {3}{B}{B}{B}.
When Massacre Wurm enters, it's first ability triggers, giving all opposing creatures -2/-2 until end of turn.
All of your opponents' lands die as a state-based action due to having zero or less toughness, as they are creatures due to Nature's Revolt.
When the lands die, Massacre Wurm's second ability triggers for each land that dies this way, causing each opponent to lose 2 life for each land that died under their control.

Nature's Revolt

Cast Massacre Wurm by paying {3}{B}{B}{B}.
When Massacre Wurm enters, it's first ability triggers, giving all opposing creatures -2/-2 until end of turn.
All of your opponents' lands die as a state-based action due to having zero or less toughness, as they are creatures due to Living Plane.
When the lands die, Massacre Wurm's second ability triggers for each land that dies this way, causing each opponent to lose 2 life for each land that died under their control.

Living Plane

Cast Life by paying {G}, causing all lands you control to become 1/1 creatures that are still lands until end of turn.
Activate all mana producing lands and creatures you control by tapping them, adding at least {4}{R}{R}.
Activate Aggravated Assault by paying {3}{R}{R}, untapping all creatures you control and getting an additional combat and main phase after this phase.
Repeat from step 2.

Infinite combat phases

Infinite mana creatures you control can produce

Infinite mana lands you control can produce

Aggravated Assault

Life // Death

Cast the instant or sorcery by paying its mana cost.
Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery.
Resolve the copy of the instant or sorcery, untapping Stella Lee.
Repeat from step 2.

Infinite copies of one instant or sorcery

Infinite magecraft triggers

Instant or Sorcery that untaps a Creature

Stella Lee, Wild Card

Cast Moritte either from your hand or from the command zone by paying {2}{G}{U}{U} plus commander tax if applicable. Choose to have it enter as a copy of the persist creature that is still legendary.
Put Moritte into your graveyard due to the legend rule. When it dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to its ability. Choose to have it enter as a copy of the persist creature that is still legendary.
Repeat step 2.

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