Anti-Venom, Horrifying Healer
Agatha's Soul Cauldron
Walking Ballista
The Earth Crystal

   Prerequisites

What do I need to start this combo?
Walking Ballista in exile (Walking Ballista exiled by Agatha's Soul Cauldron in exile).
All other permanents on the battlefield (Anti-Venom with a +1/+1 counter on it on the battlefield).

   Steps

How does this combo work?
1
Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, targeting itself and putting two +1/+1 counters on it due to its replacement effect and The Earth Crystal.
2
Activate Anti-Venom using Walking Ballista's ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
3
Repeat.

   Results

What do I get from this combo?
Infinite damage
Infinite +1/+1 counters on a creature
Yuna, Grand Summoner
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Miles Morales
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Tidus, Yuna's Guardian
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Atraxa, Praetors' Voice
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Atla Palani, Nest Tender
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Treebeard, Gracious Host
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Betor, Ancestor's Voice
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Captain Sisay
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Kutzil, Malamet Exemplar
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Shalai and Hallar
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High Synergy Cards
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Doubling Season
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49%synergy
Top Cards
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Game Changers
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Creatures
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Instants
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Sorceries
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Utility Artifacts
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Enchantments
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Artifacts
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21%synergy
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Utility Lands
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Mana Artifacts
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