Mairsil, the Pretender + Endling + Cauldron of Souls + Blood Pet + Thousand-Year Elixir

Mairsil, the Pretender
Endling
Cauldron of Souls
Blood Pet
Thousand-Year Elixir

Requires
Mairsil, the Pretender must be on the battlefield. Endling must be in exile. Cauldron of Souls must be in exile. Blood Pet must be in exile. Thousand-Year Elixir must be on the battlefield.
Steps
  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding .
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Endling's third ability by paying , giving Mairsil undying until end of turn.
  5. Activate Mairsil using Blood Pet's ability by sacrificing it, adding .
  6. When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Repeat.
Results
Infinite black mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Mairsil, the Pretender
0.57% of 1576 decks 9 decks
High Synergy Cards
Aetherling
89% of 9 decks +88% synergy
Pack Rat
89% of 9 decks +87% synergy
Blood Vassal
78% of 9 decks +78% synergy
Torchling
78% of 9 decks +77% synergy
Asmodeus the Archfiend
78% of 9 decks +77% synergy
Walking Ballista
78% of 9 decks +77% synergy
Oriq Loremage
78% of 9 decks +77% synergy
Nevinyrral's Disk
78% of 9 decks +76% synergy
Buried Alive
78% of 9 decks +74% synergy
Anger
78% of 9 decks +68% synergy
Top Cards
Gilded Lotus
78% of 9 decks +73% synergy
The One Ring
75% of 8 decks +60% synergy
Cinderhaze Wretch
67% of 9 decks +67% synergy
Magus of the Bazaar
67% of 9 decks +67% synergy
Anthroplasm
67% of 9 decks +67% synergy
Hateflayer
67% of 9 decks +66% synergy
Quicksilver Elemental
67% of 9 decks +66% synergy
Staff of Domination
67% of 9 decks +66% synergy
Arcanis the Omnipotent
67% of 9 decks +65% synergy
Entomb
67% of 9 decks +60% synergy
Creatures
Ulamog's Dreadsire
100% of 2 decks +100% synergy
Kitsa, Otterball Elite
100% of 1 decks +99% synergy
Sage of Hours
56% of 9 decks +55% synergy
Crystalline Crawler
56% of 9 decks +55% synergy
Spikeshot Elder
56% of 9 decks +55% synergy
Triskelion
56% of 9 decks +55% synergy
Horseshoe Crab
56% of 9 decks +55% synergy
Deathbringer Thoctar
56% of 9 decks +55% synergy
Cavern Harpy
56% of 9 decks +55% synergy
Tree of Perdition
56% of 9 decks +55% synergy
Jace's Archivist
56% of 9 decks +49% synergy
Argent Sphinx
44% of 9 decks +44% synergy
Mirror-Mad Phantasm
44% of 9 decks +44% synergy
Morphling
44% of 9 decks +44% synergy
Arco-Flagellant
38% of 8 decks +37% synergy
Triskelavus
33% of 9 decks +33% synergy
Cephalid Inkshrouder
33% of 9 decks +33% synergy
Eater of the Dead
33% of 9 decks +33% synergy
Shauku, Endbringer
33% of 9 decks +33% synergy
Pili-Pala
33% of 9 decks +33% synergy
Galecaster Colossus
33% of 9 decks +32% synergy
Likeness Looter
33% of 6 decks +31% synergy
Overeager Apprentice
22% of 9 decks +22% synergy
Death Cultist
22% of 9 decks +22% synergy
Carnifex Demon
22% of 9 decks +22% synergy
Blighted Bat
22% of 9 decks +22% synergy
Ovinomancer
22% of 9 decks +22% synergy
Necrotic Ooze
22% of 9 decks +22% synergy
Minion of Leshrac
22% of 9 decks +22% synergy
Mercurial Chemister
22% of 9 decks +22% synergy
Goro-Goro, Disciple of Ryusei
22% of 9 decks +21% synergy
Displacer Kitten
22% of 9 decks +18% synergy
Thassa's Oracle
22% of 9 decks +14% synergy
Spark Double
22% of 9 decks +14% synergy
Omen Hawker
14% of 7 decks +14% synergy
Argivian Avenger
12% of 8 decks +12% synergy
Lunar Avenger
11% of 9 decks +11% synergy
Ghost-Lit Warder
11% of 9 decks +11% synergy
Darting Merfolk
11% of 9 decks +11% synergy
Skill Borrower
11% of 9 decks +11% synergy
Cryptic Trilobite
11% of 9 decks +11% synergy
Crimson Mage
11% of 9 decks +11% synergy
Workhorse
11% of 9 decks +11% synergy
Mogg Fanatic
11% of 9 decks +11% synergy
Knacksaw Clique
11% of 9 decks +11% synergy
Amaranthine Wall
11% of 9 decks +11% synergy
Skyship Stalker
11% of 9 decks +11% synergy
Soul of New Phyrexia
11% of 9 decks +11% synergy
Grinning Ignus
11% of 9 decks +11% synergy
Alchemist's Apprentice
11% of 9 decks +11% synergy
Instants
Frantic Search
56% of 9 decks +41% synergy
Counterspell
56% of 9 decks +11% synergy
Intuition
44% of 9 decks +42% synergy
Vampiric Tutor
44% of 9 decks +26% synergy
Fierce Guardianship
44% of 9 decks +25% synergy
Terminate
44% of 9 decks +16% synergy
Demand Answers
40% of 5 decks +37% synergy
Ghostly Flicker
33% of 9 decks +27% synergy
Fell the Profane
33% of 3 decks +22% synergy
Sink into Stupor
33% of 3 decks +22% synergy
Fact or Fiction
33% of 9 decks +21% synergy
Mana Drain
33% of 9 decks +17% synergy
Swan Song
33% of 9 decks +16% synergy
Cyclonic Rift
33% of 9 decks +5% synergy
Planar Incision
22% of 9 decks +20% synergy
Izzet Charm
22% of 9 decks +19% synergy
Essence Flux
22% of 9 decks +19% synergy
Deflecting Swat
22% of 9 decks +6% synergy
Dark Ritual
22% of 9 decks -7% synergy
Flame of Anor
14% of 7 decks +8% synergy
Saw in Half
12% of 8 decks +10% synergy
Forbid
11% of 9 decks +11% synergy
Tolarian Winds
11% of 9 decks +11% synergy
First Day of Class
11% of 9 decks +11% synergy
Capsize
11% of 9 decks +11% synergy
Remand
11% of 9 decks +11% synergy
Thirst for Discovery
11% of 9 decks +11% synergy
Saw It Coming
11% of 9 decks +10% synergy
Blur
11% of 9 decks +10% synergy
Teferi's Time Twist
11% of 9 decks +9% synergy
Fire Covenant
11% of 9 decks +9% synergy
Crosis's Charm
11% of 9 decks +7% synergy
Lightning Bolt
11% of 9 decks +5% synergy
Flusterstorm
11% of 9 decks +4% synergy
Thrill of Possibility
11% of 9 decks +3% synergy
Pact of Negation
11% of 9 decks +3% synergy
Force of Will
11% of 9 decks -0% synergy
Deadly Rollick
11% of 9 decks -1% synergy
Rakdos Charm
11% of 9 decks -4% synergy
Mystical Tutor
11% of 9 decks -4% synergy
Brainstorm
11% of 9 decks -9% synergy
An Offer You Can't Refuse
11% of 9 decks -11% synergy
Negate
11% of 9 decks -13% synergy
Arcane Denial
11% of 9 decks -17% synergy
Chaos Warp
11% of 9 decks -30% synergy
Sorceries
Demonic Tutor
67% of 9 decks +43% synergy
Faithless Looting
56% of 9 decks +36% synergy
Unmarked Grave
44% of 9 decks +42% synergy
Grim Tutor
44% of 9 decks +40% synergy
Windfall
44% of 9 decks +20% synergy
Cathartic Reunion
33% of 9 decks +32% synergy
Wheel of Fortune
33% of 9 decks +24% synergy
Gamble
33% of 9 decks +24% synergy
Toxic Deluge
33% of 9 decks +13% synergy
Blasphemous Act
33% of 9 decks -16% synergy
Final Parting
22% of 9 decks +21% synergy
Careful Study
22% of 9 decks +21% synergy
Molten Collapse
20% of 5 decks +18% synergy
Reckless Handling
14% of 7 decks +13% synergy
Morality Shift
11% of 9 decks +11% synergy
Flux
11% of 9 decks +11% synergy
Ransack the Lab
11% of 9 decks +11% synergy
Bone Shards
11% of 9 decks +11% synergy
Strategic Planning
11% of 9 decks +11% synergy
Glimpse the Unthinkable
11% of 9 decks +10% synergy
Necromantic Selection
11% of 9 decks +10% synergy
Burning Inquiry
11% of 9 decks +8% synergy
Torment of Hailfire
11% of 9 decks +6% synergy
Reforge the Soul
11% of 9 decks +6% synergy
Night's Whisper
11% of 9 decks +6% synergy
Diabolic Tutor
11% of 9 decks +5% synergy
Wheel of Misfortune
11% of 9 decks +5% synergy
Imperial Seal
11% of 9 decks +4% synergy
Whispering Madness
11% of 9 decks +4% synergy
Damnation
11% of 9 decks +1% synergy
Ponder
11% of 9 decks +0% synergy
Vandalblast
11% of 9 decks -7% synergy
Reanimate
11% of 9 decks -9% synergy
Feed the Swarm
11% of 9 decks -25% synergy
Utility Artifacts
Pendant of Prosperity
56% of 9 decks +55% synergy
Heartstone
33% of 9 decks +33% synergy
Magistrate's Scepter
22% of 9 decks +22% synergy
Mirage Mirror
22% of 9 decks +21% synergy
Conjurer's Closet
22% of 9 decks +19% synergy
Phyrexian Altar
22% of 9 decks +18% synergy
Swiftfoot Boots
22% of 9 decks -4% synergy
Lightning Greaves
22% of 9 decks -8% synergy
The Enigma Jewel
17% of 6 decks +16% synergy
Collector's Vault
17% of 6 decks +16% synergy
Agatha's Soul Cauldron
17% of 6 decks +15% synergy
Ring of Three Wishes
11% of 9 decks +11% synergy
Netherborn Altar
11% of 9 decks +11% synergy
Crystal Shard
11% of 9 decks +10% synergy
Illusionist's Bracers
11% of 9 decks +10% synergy
Elixir of Immortality
11% of 9 decks +10% synergy
Rings of Brighthearth
11% of 9 decks +10% synergy
Wayfarer's Bauble
11% of 9 decks -7% synergy
Enchantments
Training Grounds
44% of 9 decks +44% synergy
Rhystic Study
33% of 9 decks +6% synergy
Mystic Remora
22% of 9 decks +6% synergy
Rising of the Day
14% of 7 decks +10% synergy
Mass Hysteria
11% of 9 decks +11% synergy
Candlekeep Sage
11% of 9 decks +11% synergy
Freed from the Real
11% of 9 decks +11% synergy
Fervor
11% of 9 decks +10% synergy
Bastion of Remembrance
11% of 9 decks +10% synergy
The Meathook Massacre
11% of 9 decks +9% synergy
Sneak Attack
11% of 9 decks +5% synergy
Animate Dead
11% of 9 decks +3% synergy
Underworld Breach
11% of 9 decks +2% synergy
Propaganda
11% of 9 decks -1% synergy
Planeswalkers
Jace, Wielder of Mysteries
22% of 9 decks +21% synergy
Vraska, Betrayal's Sting
12% of 8 decks +11% synergy
Daretti, Scrap Savant
11% of 9 decks +9% synergy
Ashiok, Dream Render
11% of 9 decks +8% synergy
Nicol Bolas, Dragon-God
11% of 9 decks +7% synergy
Utility Lands
Riptide Laboratory
56% of 9 decks +52% synergy
Minamo, School at Water's Edge
44% of 9 decks +42% synergy
Arena of Glory
33% of 3 decks +28% synergy
Otawara, Soaring City
33% of 9 decks +18% synergy
Urborg, Tomb of Yawgmoth
33% of 9 decks +17% synergy
Vault of Whispers
22% of 9 decks +16% synergy
Great Furnace
22% of 9 decks +16% synergy
Seat of the Synod
22% of 9 decks +16% synergy
Reliquary Tower
22% of 9 decks -12% synergy
Flamekin Village
11% of 9 decks +11% synergy
Sanctum of Eternity
11% of 9 decks +11% synergy
Darksteel Citadel
11% of 9 decks +9% synergy
Command Beacon
11% of 9 decks +6% synergy
Desolate Lighthouse
11% of 9 decks +4% synergy
Temple of the False God
11% of 9 decks +2% synergy
Ancient Tomb
11% of 9 decks -2% synergy
Bojuka Bog
11% of 9 decks -14% synergy
Mana Artifacts
Sol Ring
89% of 9 decks -2% synergy
Arcane Signet
78% of 9 decks -10% synergy
Izzet Signet
56% of 9 decks +15% synergy
Talisman of Creativity
56% of 9 decks +11% synergy
Talisman of Indulgence
44% of 9 decks +4% synergy
Dimir Signet
44% of 9 decks +0% synergy
Talisman of Dominance
44% of 9 decks -3% synergy
Coveted Jewel
33% of 9 decks +32% synergy
Fellwar Stone
33% of 9 decks -2% synergy
Ventifact Bottle
22% of 9 decks +22% synergy
Nyx Lotus
22% of 9 decks +22% synergy
Chromatic Orrery
22% of 9 decks +21% synergy
Thran Dynamo
22% of 9 decks +16% synergy
Mana Vault
22% of 9 decks +13% synergy
Rakdos Signet
22% of 9 decks -20% synergy
Relic of Sauron
14% of 7 decks -12% synergy
Staff of Compleation
12% of 8 decks +12% synergy
Machine God's Effigy
12% of 8 decks +8% synergy
Patriar's Seal
11% of 9 decks +10% synergy
Lotus Bloom
11% of 9 decks +10% synergy
Sol Talisman
11% of 9 decks +9% synergy
Sky Diamond
11% of 9 decks +9% synergy
Basalt Monolith
11% of 9 decks +9% synergy
Grim Monolith
11% of 9 decks +7% synergy
Lion's Eye Diamond
11% of 9 decks +6% synergy
Worn Powerstone
11% of 9 decks +5% synergy
Jeweled Lotus
11% of 9 decks +5% synergy
Mox Diamond
11% of 9 decks +5% synergy
Lotus Petal
11% of 9 decks +2% synergy
Mana Crypt
11% of 9 decks +0% synergy
Commander's Sphere
11% of 9 decks -15% synergy
Lands
Blood Crypt
67% of 9 decks +23% synergy
Xander's Lounge
67% of 9 decks +23% synergy
Steam Vents
67% of 9 decks +23% synergy
Watery Grave
67% of 9 decks +22% synergy
Thundering Falls
60% of 5 decks +47% synergy
Undercity Sewers
60% of 5 decks +44% synergy
Polluted Delta
56% of 9 decks +25% synergy
Bloodstained Mire
56% of 9 decks +25% synergy
Drowned Catacomb
56% of 9 decks +16% synergy
Dragonskull Summit
56% of 9 decks +14% synergy
Command Tower
56% of 9 decks -36% synergy
Badlands
44% of 9 decks +30% synergy
Underground River
44% of 9 decks +20% synergy
Scalding Tarn
44% of 9 decks +13% synergy
Training Center
44% of 9 decks +9% synergy
Exotic Orchard
44% of 9 decks -13% synergy
Raucous Theater
40% of 5 decks +26% synergy
Wooded Foothills
33% of 9 decks +25% synergy
Flooded Strand
33% of 9 decks +24% synergy
City of Brass
33% of 9 decks +20% synergy
Volcanic Island
33% of 9 decks +19% synergy
Underground Sea
33% of 9 decks +19% synergy
Stormcarved Coast
33% of 9 decks +11% synergy
Luxury Suite
33% of 9 decks -1% synergy
Morphic Pool
33% of 9 decks -1% synergy
Smoldering Marsh
33% of 9 decks -5% synergy
Sunken Hollow
33% of 9 decks -9% synergy
Sulfur Falls
33% of 9 decks -9% synergy
Verdant Catacombs
22% of 9 decks +13% synergy
Marsh Flats
22% of 9 decks +12% synergy
Maestros Theater
22% of 9 decks +8% synergy
Haunted Ridge
22% of 9 decks +2% synergy
Terramorphic Expanse
22% of 9 decks -2% synergy
Sulfurous Springs
22% of 9 decks -2% synergy
Shipwreck Marsh
22% of 9 decks -3% synergy
Shivan Reef
22% of 9 decks -6% synergy
Crumbling Necropolis
22% of 9 decks -37% synergy
Scene of the Crime
20% of 5 decks +20% synergy
Power Depot
11% of 9 decks +11% synergy
Tarnished Citadel
11% of 9 decks +10% synergy
Drossforge Bridge
11% of 9 decks +6% synergy
Mistvault Bridge
11% of 9 decks +6% synergy
Silverbluff Bridge
11% of 9 decks +6% synergy
Grixis Panorama
11% of 9 decks +5% synergy
Cavern of Souls
11% of 9 decks +5% synergy
Clearwater Pathway
11% of 9 decks +2% synergy
Arid Mesa
11% of 9 decks +1% synergy
Misty Rainforest
11% of 9 decks +1% synergy
Mana Confluence
11% of 9 decks -1% synergy
Temple of Malice
11% of 9 decks -3% synergy