Sengir, the Dark Baron + Agatha's Soul Cauldron + Walking Ballista

Sengir, the Dark Baron
Agatha's Soul Cauldron
Walking Ballista

Requires
Sengir, the Dark Baron must be on the battlefield. Agatha's Soul Cauldron must be on the battlefield. Walking Ballista must be in exile (exiled by Agatha's Soul Cauldron). Sengir has at least one +1/+1 counter on it. You have a way to give Sengir deathtouch.
Steps
  1. Give Sengir deathtouch, if needed.
  2. Activate Sengir using Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to any creature an opponent controls, and killing it due to Sengir's deathtouch.
  3. When the creature dies, Sengir's first ability triggers, putting two +1/+1 counters on it.
  4. Repeat from step 2 as desired.
Results
Destroy all creatures that enter the battlefield under an opponent's control. Destroy all creatures opponents control.

Cazur, Ruthless Stalker // Ukkima, Stalking Shadow
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Creatures
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Momir Vig, Simic Visionary
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Simic Manipulator
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Spike Weaver
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Bloodspore Thrinax
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Zegana, Utopian Speaker
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Metallic Mimic
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Surrak and Goreclaw
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God-Eternal Rhonas
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Ancient Bronze Dragon
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Reyhan, Last of the Abzan
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Tanazir Quandrix
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Necropolis Regent
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Instants
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Utility Artifacts
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Enchantments
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Utility Lands
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Lands
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