Shay Cormac
Agatha's Soul Cauldron
Walking Ballista

   Prerequisites

What do I need to start this combo?
Walking Ballista in exile (Walking Ballista exiled by Agatha's Soul Cauldron in exile).
Shay Cormac and Agatha's Soul Cauldron on the battlefield.
Shay Cormac has at least one +1/+1 counter on it. You have a way to give Shay Cormac deathtouch.

   Steps

How does this combo work?
1
Give Shay Cormac deathtouch, if needed.
2
Activate Shay Cormac using Walking Ballista's second ability by removing a +1/+1 counter from it, targeting a creature an opponent controls.
3
Shay Cormac's first ability triggers, putting a bounty counter on the targeted creature.
4
Resolve the Shay Cormac ability from step 2, dealing 1 damage to the creature and killing it due to Shay Cormac's deathtouch.
5
When the creature dies, Shay Cormac's second ability triggers, putting two +1/+1 counters on it.
6
Repeat from step 2.
7
If the method giving Shay Cormac deathtouch lasts indefinitely, you may repeat this loop whenever a creature enters the battlefield under an opponent's control.

   Results

What do I get from this combo?
Destroy each creature that enters the battlefield under an opponent's control
Destroy all creatures opponents control
Lock
Shay Cormac
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Sorceries
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The Black Gate
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Mana Artifacts
Sol Ring
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Arcane Signet
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Talisman of Hierarchy
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Mox Amber
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Orzhov Signet
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Fellwar Stone
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Lotus Petal
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Mox Opal
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Mind Stone
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Chrome Mox
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Bounty Board
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Mana Vault
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Grim Monolith
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Mox Diamond
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Chromatic Lantern
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Lands
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