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
0.03% of 3814 decks 1 decks
Mikaeus, the Unhallowed
0.07% of 1365 decks 1 decks
Reyhan, Last of the Abzan // Tevesh Szat, Doom of Fools
2.00% of 50 decks 1 decks
New Cards
Drag to the Roots
100% of 1 decks +94% synergy
Mossborn Hydra
100% of 1 decks +89% synergy
Quilled Greatwurm
100% of 1 decks +83% synergy
Twitching Doll
100% of 1 decks +97% synergy
Ozox, the Clattering King
50% of 2 decks +49% synergy
Creatures
Cytoplast Manipulator
100% of 1 decks +100% synergy
Simic Manipulator
100% of 1 decks +100% synergy
Momir Vig, Simic Visionary
100% of 1 decks +100% synergy
Tanazir Quandrix
100% of 1 decks +99% synergy
Toothy, Imaginary Friend
100% of 1 decks +99% synergy
Cleopatra, Exiled Pharaoh
100% of 1 decks +99% synergy
Roalesk, Apex Hybrid
100% of 1 decks +99% synergy
Ornery Tumblewagg
100% of 1 decks +99% synergy
Altered Ego
100% of 1 decks +99% synergy
Gruff Triplets
100% of 1 decks +98% synergy
Zegana, Utopian Speaker
100% of 1 decks +98% synergy
Nightshade Dryad
100% of 1 decks +97% synergy
Poison Dart Frog
100% of 1 decks +97% synergy
Vorel of the Hull Clade
100% of 1 decks +97% synergy
Prime Speaker Zegana
100% of 1 decks +97% synergy
Herald of Secret Streams
100% of 1 decks +97% synergy
Arwen, Weaver of Hope
100% of 2 decks +97% synergy
Yarok, the Desecrated
100% of 1 decks +97% synergy
Master Biomancer
100% of 1 decks +96% synergy
Goldvein Hydra
100% of 1 decks +96% synergy
Fathom Mage
100% of 1 decks +96% synergy
Kodama of the West Tree
100% of 2 decks +96% synergy
Evolution Witness
100% of 1 decks +95% synergy
Bristly Bill, Spine Sower
100% of 1 decks +95% synergy
Hydroid Krasis
100% of 1 decks +95% synergy
Corpsejack Menace
100% of 2 decks +95% synergy
Forgotten Ancient
100% of 2 decks +94% synergy
Spark Double
100% of 1 decks +93% synergy
Thassa's Oracle
100% of 1 decks +93% synergy
Honest Rutstein
100% of 1 decks +92% synergy
Spiritmonger
50% of 2 decks +50% synergy
Spike Weaver
50% of 2 decks +50% synergy
Kurbis, Harvest Celebrant
50% of 2 decks +50% synergy
Bloodspore Thrinax
50% of 2 decks +50% synergy
Avabruck Caretaker
50% of 2 decks +49% synergy
Grakmaw, Skyclave Ravager
50% of 2 decks +49% synergy
Conclave Sledge-Captain
50% of 2 decks +49% synergy
Pir, Imaginative Rascal
50% of 2 decks +49% synergy
Reyhan, Last of the Abzan
50% of 2 decks +49% synergy
God-Eternal Rhonas
50% of 2 decks +49% synergy
Threefold Thunderhulk
50% of 2 decks +49% synergy
Forsaken Miner
50% of 2 decks +49% synergy
Benevolent Hydra
50% of 2 decks +49% synergy
Steelbane Hydra
50% of 2 decks +48% synergy
Ancient Bronze Dragon
50% of 2 decks +48% synergy
Vengeful Bloodwitch
50% of 2 decks +48% synergy
Renata, Called to the Hunt
50% of 2 decks +48% synergy
Massacre Girl, Known Killer
50% of 2 decks +48% synergy
Vein Ripper
50% of 2 decks +48% synergy
Maha, Its Feathers Night
50% of 2 decks +47% synergy
Instants
Gift of the Viper
100% of 1 decks +96% synergy
Tear Asunder
50% of 2 decks +44% synergy
Tamiyo's Safekeeping
50% of 2 decks +43% synergy
Inspiring Call
50% of 2 decks +42% synergy
Heroic Intervention
50% of 2 decks +20% synergy
Supernatural Stamina
33% of 3 decks +32% synergy
Tragic Slip
33% of 3 decks +30% synergy
Vampiric Tutor
33% of 3 decks +15% synergy
Sorceries
Flare of Cultivation
100% of 1 decks +97% synergy
Culling Ritual
50% of 2 decks +39% synergy
Blood on the Snow
33% of 3 decks +33% synergy
Grim Tutor
33% of 3 decks +29% synergy
Demonic Tutor
33% of 3 decks +11% synergy
Utility Artifacts
The Great Henge
100% of 2 decks +90% synergy
The Ozolith
67% of 3 decks +63% synergy
Ashnod's Altar
67% of 3 decks +59% synergy
Fractal Harness
50% of 2 decks +49% synergy
Bow of Nylea
50% of 2 decks +48% synergy
Ozolith, the Shattered Spire
50% of 2 decks +44% synergy
Blasting Station
33% of 3 decks +33% synergy
Nim Deathmantle
33% of 3 decks +33% synergy
Mycosynth Lattice
33% of 3 decks +33% synergy
Dowsing Dagger
33% of 3 decks +32% synergy
Krark-Clan Ironworks
33% of 3 decks +32% synergy
Blade of Selves
33% of 3 decks +32% synergy
Altar of Dementia
33% of 3 decks +31% synergy
Shadowspear
33% of 3 decks +30% synergy
Phyrexian Altar
33% of 3 decks +29% synergy
Sword of the Animist
33% of 3 decks +29% synergy
Wishclaw Talisman
33% of 3 decks +28% synergy
Enchantments
Marit Lage's Slumber
100% of 1 decks +100% synergy
Death's Presence
100% of 2 decks +99% synergy
Hadana's Climb
100% of 1 decks +98% synergy
Bred for the Hunt
100% of 1 decks +98% synergy
Communal Brewing
100% of 1 decks +97% synergy
Innkeeper's Talent
100% of 1 decks +91% synergy
Grafted Growth
50% of 2 decks +50% synergy
Path of Discovery
50% of 2 decks +49% synergy
Zendikar Resurgent
50% of 2 decks +47% synergy
Rancor
50% of 2 decks +45% synergy
Branching Evolution
50% of 2 decks +45% synergy
Utopia Sprawl
50% of 2 decks +42% synergy
Hardened Scales
50% of 2 decks +41% synergy
Doubling Season
50% of 2 decks +41% synergy
Garruk's Uprising
50% of 2 decks +35% synergy
Night of Souls' Betrayal
33% of 3 decks +33% synergy
Retribution of the Ancients
33% of 3 decks +33% synergy
Heartless Summoning
33% of 3 decks +32% synergy
Bastion of Remembrance
33% of 3 decks +27% synergy
Planeswalkers
Oko, the Trickster
100% of 1 decks +100% synergy
Vivien, Arkbow Ranger
50% of 2 decks +50% synergy
Grist, the Hunger Tide
50% of 2 decks +46% synergy
Utility Lands
Crawling Barrens
33% of 3 decks +33% synergy
Witch's Clinic
33% of 3 decks +32% synergy
Karn's Bastion
33% of 3 decks +28% synergy
Urza's Saga
33% of 3 decks +26% synergy
Cabal Coffers
33% of 3 decks +23% synergy
Mana Artifacts
Sol Ring
100% of 3 decks +16% synergy
Arcane Signet
67% of 3 decks -5% synergy
Golgari Signet
50% of 2 decks +37% synergy
Chromatic Orrery
33% of 3 decks +32% synergy
Fellwar Stone
33% of 3 decks +12% synergy
Lands
Rimewood Falls
100% of 1 decks +95% synergy
Waterlogged Grove
100% of 1 decks +93% synergy
Vineglimmer Snarl
100% of 1 decks +90% synergy
Temple of Mystery
100% of 1 decks +83% synergy
Rejuvenating Springs
100% of 1 decks +71% synergy
Command Tower
67% of 3 decks -7% synergy
Thriving Grove
50% of 2 decks +48% synergy
Jungle Hollow
50% of 2 decks +41% synergy
Necroblossom Snarl
50% of 2 decks +38% synergy
Tainted Wood
50% of 2 decks +37% synergy
Temple of Malady
50% of 2 decks +34% synergy
Golgari Rot Farm
50% of 2 decks +32% synergy
Undergrowth Stadium
50% of 2 decks +24% synergy
Overgrown Tomb
50% of 2 decks +8% synergy
Opal Palace
33% of 3 decks +31% synergy
Exotic Orchard
33% of 3 decks -2% synergy