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.

Mairsil, the Pretender
0.25% of 1576 decks 4 decks
K'rrik, Son of Yawgmoth
0.02% of 13841 decks 3 decks
Trazyn the Infinite
0.10% of 1990 decks 2 decks
Old Stickfingers
0.07% of 2786 decks 2 decks
Whisper, Blood Liturgist
0.65% of 308 decks 2 decks
The Scarab God
0.02% of 10352 decks 2 decks
Oskar, Rubbish Reclaimer
0.04% of 2250 decks 1 decks
Ink-Eyes, Servant of Oni
0.45% of 223 decks 1 decks
Tinybones, the Pickpocket
0.06% of 1622 decks 1 decks
Francisco, Fowl Marauder // Kodama of the East Tree
33.33% of 3 decks 1 decks
The Necrobloom
0.01% of 9366 decks 1 decks
Hogaak, Arisen Necropolis
0.05% of 1854 decks 1 decks
Sidisi, Brood Tyrant
0.02% of 6243 decks 1 decks
Kodama of the East Tree // Ravos, Soultender
0.36% of 279 decks 1 decks
Slimefoot and Squee
0.01% of 7791 decks 1 decks
Meren of Clan Nel Toth
0.01% of 14905 decks 1 decks
Arvinox, the Mind Flail
0.10% of 977 decks 1 decks
Skithiryx, the Blight Dragon
0.05% of 1844 decks 1 decks
High Synergy Cards
Likeness Looter
100% of 5 decks +96% synergy
Aetherling
75% of 8 decks +75% synergy
Anger
80% of 5 decks +74% synergy
Buried Alive
69% of 29 decks +63% synergy
Faithless Looting
80% of 5 decks +63% synergy
Frantic Search
75% of 8 decks +63% synergy
Entomb
69% of 29 decks +62% synergy
Arcanis the Omnipotent
62% of 8 decks +61% synergy
Riptide Laboratory
62% of 8 decks +60% synergy
Asmodeus the Archfiend
61% of 28 decks +60% synergy
Top Cards
Blasphemous Act
80% of 5 decks +46% synergy
Windfall
62% of 8 decks +49% synergy
Assassin's Trophy
60% of 10 decks +30% synergy
Skirge Familiar
59% of 29 decks +58% synergy
Reanimate
59% of 29 decks +43% synergy
Phyrexian Devourer
55% of 29 decks +55% synergy
Triskelion
52% of 29 decks +51% synergy
Horseshoe Crab
50% of 8 decks +50% synergy
Channeler Initiate
50% of 10 decks +50% synergy
Cavern Harpy
50% of 8 decks +50% synergy
Creatures
Devoted Druid
50% of 10 decks +47% synergy
Fauna Shaman
50% of 10 decks +47% synergy
Eternal Witness
50% of 10 decks +29% synergy
Pili-Pala
41% of 29 decks +41% synergy
Magus of the Coffers
41% of 29 decks +41% synergy
Golgari Grave-Troll
40% of 10 decks +38% synergy
Fiend Artisan
40% of 10 decks +37% synergy
Sakura-Tribe Elder
40% of 10 decks +21% synergy
Birds of Paradise
40% of 10 decks +13% synergy
Cinderhaze Wretch
38% of 29 decks +38% synergy
Quicksilver Elemental
38% of 8 decks +37% synergy
Morphling
38% of 8 decks +37% synergy
Mirror-Mad Phantasm
38% of 8 decks +37% synergy
Tribute Mage
38% of 8 decks +35% synergy
Thassa, Deep-Dwelling
38% of 8 decks +34% synergy
Thassa's Oracle
38% of 8 decks +30% synergy
Farmstead Gleaner
34% of 29 decks +34% synergy
Palladium Myr
34% of 29 decks +32% synergy
Elvish Aberration
30% of 10 decks +30% synergy
Ramunap Excavator
30% of 10 decks +23% synergy
Reclamation Sage
30% of 10 decks +19% synergy
Llanowar Elves
30% of 10 decks +9% synergy
Fain, the Broker
29% of 28 decks +27% synergy
Vile Entomber
29% of 28 decks +26% synergy
Stinkweed Imp
28% of 29 decks +26% synergy
Corpse Connoisseur
24% of 29 decks +24% synergy
Blood Pet
24% of 29 decks +23% synergy
Viscera Seer
24% of 29 decks +15% synergy
Gravecrawler
21% of 29 decks +18% synergy
Mikaeus, the Unhallowed
21% of 29 decks +18% synergy
Stitcher's Supplier
21% of 29 decks +18% synergy
Opposition Agent
21% of 29 decks +13% synergy
Zulaport Cutthroat
21% of 29 decks +11% synergy
Drivnod, Carnage Dominus
18% of 22 decks +15% synergy
Dauthi Voidwalker
18% of 28 decks +10% synergy
Orcish Bowmasters
18% of 17 decks +6% synergy
Golgari Thug
17% of 29 decks +16% synergy
Woe Strider
17% of 29 decks +15% synergy
Gray Merchant of Asphodel
17% of 29 decks +8% synergy
Solemn Simulacrum
17% of 29 decks +3% synergy
Braids, Arisen Nightmare
15% of 27 decks +7% synergy
Chainer, Dementia Master
14% of 29 decks +13% synergy
Pack Rat
14% of 29 decks +13% synergy
Bloodghast
14% of 29 decks +12% synergy
Pawn of Ulamog
14% of 29 decks +12% synergy
Yawgmoth, Thran Physician
14% of 29 decks +10% synergy
Reassembling Skeleton
14% of 29 decks +10% synergy
Crypt Ghast
14% of 29 decks +9% synergy
Carrion Feeder
14% of 29 decks +9% synergy
Syr Konrad, the Grim
14% of 29 decks +5% synergy
Instants
Chaos Warp
60% of 5 decks +28% synergy
Fact or Fiction
50% of 8 decks +43% synergy
Abrupt Decay
50% of 10 decks +39% synergy
Beast Within
50% of 10 decks +11% synergy
Vampiric Tutor
48% of 29 decks +30% synergy
Dark Ritual
48% of 29 decks +26% synergy
Noxious Revival
40% of 10 decks +34% synergy
Arcane Denial
38% of 8 decks +18% synergy
An Offer You Can't Refuse
38% of 8 decks +17% synergy
Brainstorm
38% of 8 decks +16% synergy
Cyclonic Rift
38% of 8 decks +10% synergy
Grisly Salvage
30% of 10 decks +25% synergy
Veil of Summer
30% of 10 decks +24% synergy
Worldly Tutor
30% of 10 decks +16% synergy
Putrefy
30% of 10 decks +14% synergy
Cabal Ritual
21% of 29 decks +16% synergy
Village Rites
21% of 29 decks +11% synergy
Imp's Mischief
17% of 29 decks +14% synergy
Culling the Weak
17% of 29 decks +13% synergy
Deadly Rollick
17% of 29 decks +7% synergy
Infernal Grasp
14% of 28 decks +7% synergy
Defile
14% of 29 decks +10% synergy
Sheoldred's Edict
14% of 22 decks +11% synergy
Cut Down
11% of 27 decks +10% synergy
Deadly Dispute
11% of 28 decks -0% synergy
Snuff Out
10% of 29 decks +8% synergy
Demonic Consultation
10% of 29 decks +7% synergy
Tainted Pact
10% of 29 decks +6% synergy
Malakir Rebirth
10% of 29 decks +2% synergy
Sorceries
Gamble
60% of 5 decks +50% synergy
Demonic Tutor
55% of 29 decks +33% synergy
Life from the Loam
50% of 10 decks +46% synergy
Toxic Deluge
45% of 29 decks +27% synergy
Unmarked Grave
43% of 28 decks +40% synergy
Green Sun's Zenith
40% of 10 decks +34% synergy
Careful Study
38% of 8 decks +36% synergy
Preordain
38% of 8 decks +27% synergy
Ponder
38% of 8 decks +25% synergy
Diabolic Intent
34% of 29 decks +26% synergy
Finale of Devastation
30% of 10 decks +22% synergy
Beseech the Mirror
27% of 15 decks +22% synergy
Final Parting
24% of 29 decks +22% synergy
Grim Tutor
24% of 29 decks +19% synergy
Dread Return
24% of 29 decks +19% synergy
Imperial Seal
24% of 29 decks +18% synergy
Feed the Swarm
24% of 29 decks +6% synergy
Torment of Hailfire
21% of 29 decks +16% synergy
Victimize
21% of 29 decks +9% synergy
Damnation
17% of 29 decks +9% synergy
Night's Whisper
17% of 29 decks +8% synergy
Sign in Blood
17% of 29 decks +7% synergy
Bone Shards
14% of 28 decks +13% synergy
Persist
14% of 28 decks +12% synergy
Ransack the Lab
10% of 29 decks +10% synergy
Bubbling Muck
10% of 29 decks +9% synergy
Stitch Together
10% of 29 decks +9% synergy
Mutilate
10% of 29 decks +8% synergy
Dark Deal
10% of 29 decks +8% synergy
Syphon Mind
10% of 29 decks +7% synergy
Agadeem's Awakening
10% of 29 decks +7% synergy
Living Death
10% of 29 decks +5% synergy
Diabolic Tutor
10% of 29 decks +4% synergy
Utility Artifacts
Lightning Greaves
45% of 29 decks +19% synergy
Swiftfoot Boots
45% of 29 decks +17% synergy
Staff of Domination
28% of 29 decks +26% synergy
Ashnod's Altar
28% of 29 decks +20% synergy
Agatha's Soul Cauldron
20% of 15 decks +18% synergy
The One Ring
20% of 20 decks +11% synergy
Nevinyrral's Disk
17% of 29 decks +16% synergy
Mesmeric Orb
17% of 29 decks +16% synergy
Jet Medallion
17% of 29 decks +14% synergy
Altar of Dementia
17% of 29 decks +14% synergy
Expedition Map
17% of 29 decks +14% synergy
Pendant of Prosperity
14% of 29 decks +13% synergy
Wishclaw Talisman
14% of 29 decks +8% synergy
Bolas's Citadel
14% of 29 decks +4% synergy
Perpetual Timepiece
10% of 29 decks +9% synergy
Bontu's Monument
10% of 29 decks +8% synergy
Thousand-Year Elixir
10% of 29 decks +8% synergy
Aetherflux Reservoir
10% of 29 decks +7% synergy
Sensei's Divining Top
10% of 29 decks +5% synergy
Skullclamp
10% of 29 decks -2% synergy
Enchantments
Survival of the Fittest
40% of 10 decks +38% synergy
Rhystic Study
38% of 8 decks +10% synergy
Animate Dead
31% of 29 decks +22% synergy
Sylvan Library
30% of 10 decks +18% synergy
Black Market Connections
25% of 28 decks +14% synergy
Necromancy
24% of 29 decks +21% synergy
Phyrexian Reclamation
21% of 29 decks +17% synergy
Dance of the Dead
17% of 29 decks +16% synergy
Phyrexian Arena
17% of 29 decks +2% synergy
Tortured Existence
10% of 29 decks +9% synergy
Black Market
10% of 29 decks +6% synergy
Utility Lands
Otawara, Soaring City
50% of 8 decks +33% synergy
Urborg, Tomb of Yawgmoth
45% of 29 decks +35% synergy
Phyrexian Tower
34% of 29 decks +26% synergy
Ancient Tomb
34% of 29 decks +24% synergy
Boseiju, Who Endures
33% of 9 decks +14% synergy
Cabal Coffers
31% of 29 decks +20% synergy
Dryad Arbor
30% of 10 decks +26% synergy
Takenuma, Abandoned Mire
29% of 28 decks +18% synergy
Bojuka Bog
28% of 29 decks -3% synergy
Dakmor Salvage
24% of 29 decks +22% synergy
Urza's Saga
21% of 28 decks +14% synergy
Crypt of Agadeem
21% of 29 decks +19% synergy
Geier Reach Sanitarium
21% of 29 decks +17% synergy
Cabal Stronghold
21% of 29 decks +17% synergy
Yavimaya, Cradle of Growth
18% of 28 decks +9% synergy
Volrath's Stronghold
17% of 29 decks +16% synergy
Strip Mine
17% of 29 decks +14% synergy
Barren Moor
17% of 29 decks +13% synergy
Field of the Dead
14% of 29 decks +10% synergy
Command Beacon
14% of 29 decks +9% synergy
Buried Ruin
14% of 29 decks +9% synergy
Nykthos, Shrine to Nyx
14% of 29 decks +8% synergy
Castle Locthwain
10% of 29 decks +5% synergy
Reliquary Tower
10% of 29 decks -19% synergy
Mana Artifacts
Sol Ring
93% of 29 decks +9% synergy
Izzet Signet
75% of 4 decks +47% synergy
Arcane Signet
66% of 29 decks -6% synergy
Dimir Signet
62% of 8 decks +33% synergy
Talisman of Dominance
38% of 8 decks +6% synergy
Gilded Lotus
28% of 29 decks +24% synergy
Mana Crypt
24% of 29 decks +15% synergy
Mind Stone
24% of 29 decks +7% synergy
Basalt Monolith
17% of 29 decks +15% synergy
Mox Diamond
17% of 29 decks +13% synergy
Lotus Petal
17% of 29 decks +11% synergy
Commander's Sphere
17% of 29 decks +2% synergy
Fellwar Stone
17% of 29 decks -4% synergy
Mox Amber
14% of 29 decks +10% synergy
Thran Dynamo
14% of 29 decks +9% synergy
Charcoal Diamond
14% of 29 decks +8% synergy
Chrome Mox
14% of 29 decks +7% synergy
Nyx Lotus
10% of 29 decks +9% synergy
Lands
Training Center
100% of 4 decks +72% synergy
Xander's Lounge
100% of 4 decks +72% synergy
Steam Vents
100% of 4 decks +61% synergy
Luxury Suite
80% of 5 decks +54% synergy
Dragonskull Summit
80% of 5 decks +49% synergy
Blood Crypt
80% of 5 decks +41% synergy
Morphic Pool
75% of 8 decks +49% synergy
Sulfur Falls
75% of 4 decks +45% synergy
Watery Grave
75% of 8 decks +34% synergy
Command Tower
55% of 29 decks -19% synergy
Bayou
50% of 10 decks +36% synergy
Overgrown Tomb
50% of 10 decks +7% synergy
Llanowar Wastes
40% of 10 decks +14% synergy
Undergrowth Stadium
40% of 10 decks +14% synergy
Woodland Cemetery
40% of 10 decks +12% synergy
Contaminated Aquifer
38% of 8 decks +34% synergy
Underground Sea
38% of 8 decks +23% synergy
Shipwreck Marsh
38% of 8 decks +19% synergy
Underground River
38% of 8 decks +18% synergy
Drowned Catacomb
38% of 8 decks +12% synergy
Deathcap Glade
33% of 9 decks +19% synergy
Twilight Mire
30% of 10 decks +20% synergy
Bloodstained Mire
28% of 29 decks +17% synergy
Verdant Catacombs
28% of 29 decks +16% synergy
Polluted Delta
24% of 29 decks +13% synergy
Scalding Tarn
21% of 29 decks +10% synergy
Myriad Landscape
21% of 29 decks +1% synergy
Misty Rainforest
17% of 29 decks +5% synergy
Exotic Orchard
17% of 29 decks -18% synergy
Reflecting Pool
10% of 29 decks +5% synergy
Mana Confluence
10% of 29 decks +3% synergy
City of Brass
10% of 29 decks +2% synergy
Wooded Foothills
10% of 29 decks +0% synergy
Windswept Heath
10% of 29 decks -0% synergy
Marsh Flats
10% of 29 decks -1% synergy