Necrotic Ooze + Endling + Walking Ballista + Phyrexian Altar

Necrotic Ooze
Endling
Walking Ballista
Phyrexian Altar

Requires
Necrotic Ooze must be on the battlefield. Endling must be in the graveyard. Walking Ballista must be in the graveyard. Phyrexian Altar must be on the battlefield. Mana needed:
Steps
  1. Activate Necrotic Ooze using Endling's third ability by paying , giving Necrotic Ooze undying until end of turn.
  2. If Necrotic Ooze has any +1/+1 counters, activate it using Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to any target.
  3. Repeat step 2 until Necrotic Ooze has no +1/+1 counters.
  4. Activate Phyrexian Altar by sacrificing Necrotic Ooze, adding .
  5. Necrotic Ooze dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. Repeat.
Results
Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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0.20% of 1521 decks 3 decks
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0.14% of 2180 decks 3 decks
High Synergy Cards
Likeness Looter
100% of 4 decks +99% synergy
Faithless Looting
100% of 4 decks +92% synergy
Frantic Search
86% of 7 decks +80% synergy
Top Cards
Aetherling
71% of 7 decks +71% synergy
Buried Alive
66% of 29 decks +63% synergy
Entomb
66% of 29 decks +62% synergy
Assassin's Trophy
64% of 11 decks +57% synergy
Reanimate
59% of 29 decks +51% synergy
Asmodeus the Archfiend
57% of 28 decks +57% synergy
Arcanis the Omnipotent
57% of 7 decks +56% synergy
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57% of 7 decks +54% synergy
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57% of 7 decks +51% synergy
Skirge Familiar
55% of 29 decks +55% synergy
Creatures
Anger
75% of 4 decks +72% synergy
Eternal Witness
55% of 11 decks +44% synergy
Phyrexian Devourer
52% of 29 decks +52% synergy
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45% of 11 decks +37% synergy
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43% of 7 decks +43% synergy
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43% of 7 decks +43% synergy
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43% of 7 decks +42% synergy
Thassa's Oracle
43% of 7 decks +39% synergy
Cinderhaze Wretch
38% of 29 decks +38% synergy
Pili-Pala
38% of 29 decks +38% synergy
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38% of 29 decks +38% synergy
Golgari Grave-Troll
36% of 11 decks +36% synergy
Llanowar Elves
36% of 11 decks +26% synergy
Farmstead Gleaner
34% of 29 decks +34% synergy
Fain, the Broker
32% of 28 decks +31% synergy
Vile Entomber
32% of 28 decks +31% synergy
Stinkweed Imp
28% of 29 decks +27% synergy
Palladium Myr
28% of 29 decks +25% synergy
Viscera Seer
28% of 29 decks +23% synergy
Elvish Aberration
27% of 11 decks +27% synergy
Elves of Deep Shadow
27% of 11 decks +25% synergy
Ramunap Excavator
27% of 11 decks +24% synergy
Reclamation Sage
27% of 11 decks +22% synergy
Fyndhorn Elves
27% of 11 decks +21% synergy
Corpse Connoisseur
24% of 29 decks +24% synergy
Blood Pet
24% of 29 decks +24% synergy
Zulaport Cutthroat
24% of 29 decks +19% synergy
Woe Strider
21% of 29 decks +19% synergy
Stitcher's Supplier
21% of 29 decks +19% synergy
Gravecrawler
21% of 29 decks +19% synergy
Mikaeus, the Unhallowed
21% of 29 decks +19% synergy
Opposition Agent
21% of 29 decks +17% synergy
Solemn Simulacrum
21% of 29 decks +7% synergy
Drivnod, Carnage Dominus
20% of 20 decks +18% synergy
Orcish Bowmasters
20% of 15 decks +14% synergy
Dauthi Voidwalker
18% of 28 decks +13% synergy
Golgari Thug
17% of 29 decks +17% synergy
Yawgmoth, Thran Physician
17% of 29 decks +15% synergy
Gray Merchant of Asphodel
17% of 29 decks +13% synergy
Blood Artist
17% of 29 decks +11% synergy
Braids, Arisen Nightmare
15% of 27 decks +11% synergy
Voltaic Construct
14% of 29 decks +14% synergy
Chainer, Dementia Master
14% of 29 decks +13% synergy
Instants
Vampiric Tutor
52% of 29 decks +42% synergy
Dark Ritual
52% of 29 decks +41% synergy
Abrupt Decay
45% of 11 decks +43% synergy
Noxious Revival
45% of 11 decks +43% synergy
Beast Within
45% of 11 decks +27% synergy
An Offer You Can't Refuse
43% of 7 decks +33% synergy
Brainstorm
43% of 7 decks +32% synergy
Veil of Summer
36% of 11 decks +33% synergy
Grisly Salvage
27% of 11 decks +26% synergy
Putrefy
27% of 11 decks +24% synergy
Nature's Claim
27% of 11 decks +22% synergy
Worldly Tutor
27% of 11 decks +21% synergy
Culling the Weak
21% of 29 decks +19% synergy
Cabal Ritual
21% of 29 decks +18% synergy
Deadly Rollick
21% of 29 decks +15% synergy
Imp's Mischief
17% of 29 decks +16% synergy
Village Rites
17% of 29 decks +12% synergy
Sheoldred's Edict
15% of 20 decks +13% synergy
Deadly Dispute
14% of 28 decks +9% synergy
Infernal Grasp
11% of 28 decks +7% synergy
Defile
10% of 29 decks +9% synergy
Demonic Consultation
10% of 29 decks +8% synergy
Tainted Pact
10% of 29 decks +8% synergy
Malakir Rebirth
10% of 29 decks +6% synergy
Sorceries
Blasphemous Act
75% of 4 decks +59% synergy
Demonic Tutor
55% of 29 decks +43% synergy
Life from the Loam
45% of 11 decks +44% synergy
Careful Study
43% of 7 decks +42% synergy
Preordain
43% of 7 decks +37% synergy
Ponder
43% of 7 decks +36% synergy
Toxic Deluge
41% of 29 decks +33% synergy
Unmarked Grave
39% of 28 decks +38% synergy
Green Sun's Zenith
36% of 11 decks +33% synergy
Diabolic Intent
34% of 29 decks +30% synergy
Beseech the Mirror
31% of 13 decks +28% synergy
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30% of 10 decks +28% synergy
Feed the Swarm
28% of 29 decks +18% synergy
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27% of 11 decks +23% synergy
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24% of 29 decks +22% synergy
Imperial Seal
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Final Parting
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21% of 29 decks +18% synergy
Dread Return
21% of 29 decks +18% synergy
Damnation
17% of 29 decks +13% synergy
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17% of 29 decks +12% synergy
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17% of 29 decks +11% synergy
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14% of 28 decks +13% synergy
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10% of 29 decks +8% synergy
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10% of 29 decks +8% synergy
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10% of 29 decks +7% synergy
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45% of 29 decks +19% synergy
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38% of 29 decks +10% synergy
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31% of 29 decks +23% synergy
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23% of 13 decks +21% synergy
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17% of 29 decks +16% synergy
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21% of 29 decks +20% synergy
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17% of 29 decks +12% synergy
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14% of 29 decks +9% synergy
Castle Locthwain
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10% of 29 decks +4% synergy
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Gilded Lotus
24% of 29 decks +21% synergy
Mind Stone
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Mox Diamond
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Lotus Petal
17% of 29 decks +11% synergy
Nyx Lotus
14% of 29 decks +12% synergy
Basalt Monolith
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14% of 29 decks +10% synergy
Chrome Mox
14% of 29 decks +7% synergy
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Chromatic Orrery
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Grim Monolith
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Charcoal Diamond
10% of 29 decks +8% synergy
Thran Dynamo
10% of 29 decks +6% synergy
Mana Vault
10% of 29 decks +4% synergy
Jeweled Lotus
10% of 29 decks +3% synergy
Lands
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100% of 3 decks +97% synergy
Training Center
100% of 3 decks +94% synergy
Steam Vents
100% of 3 decks +91% synergy
Luxury Suite
75% of 4 decks +69% synergy
Dragonskull Summit
75% of 4 decks +68% synergy
Blood Crypt
75% of 4 decks +66% synergy
Morphic Pool
71% of 7 decks +65% synergy
Watery Grave
71% of 7 decks +61% synergy
Bayou
55% of 11 decks +52% synergy
Overgrown Tomb
55% of 11 decks +45% synergy
Command Tower
52% of 29 decks -22% synergy
Llanowar Wastes
45% of 11 decks +40% synergy
Undergrowth Stadium
45% of 11 decks +40% synergy
Woodland Cemetery
45% of 11 decks +40% synergy
Contaminated Aquifer
43% of 7 decks +42% synergy
Underground Sea
43% of 7 decks +39% synergy
Underground River
43% of 7 decks +38% synergy
Shipwreck Marsh
43% of 7 decks +38% synergy
Twilight Mire
36% of 11 decks +34% synergy
Verdant Catacombs
31% of 29 decks +19% synergy
Deathcap Glade
30% of 10 decks +27% synergy
Bloodstained Mire
28% of 29 decks +17% synergy
Nurturing Peatland
27% of 11 decks +26% synergy
Golgari Rot Farm
27% of 11 decks +23% synergy
Polluted Delta
24% of 29 decks +13% synergy
Misty Rainforest
21% of 29 decks +9% synergy
Myriad Landscape
21% of 29 decks +0% synergy
Scalding Tarn
17% of 29 decks +6% synergy
Exotic Orchard
17% of 29 decks -18% synergy
Mana Confluence
14% of 29 decks +6% synergy
City of Brass
14% of 29 decks +6% synergy
Wooded Foothills
14% of 29 decks +4% synergy
Windswept Heath
14% of 29 decks +3% synergy
Marsh Flats
14% of 29 decks +2% synergy
Prismatic Vista
10% of 29 decks +5% synergy