Deathrender + Gravedigger + Eternal Witness + Altar of Dementia

Deathrender
Gravedigger
Eternal Witness
Altar of Dementia

Requires
Deathrender must be on the battlefield. Gravedigger must be in hand. Eternal Witness must be on the battlefield. Altar of Dementia must be on the battlefield. Deathrender attached to Eternal Witness.
Steps
  1. Activate Altar of Dementia by sacrificing Eternal Witness.
  2. Eternal Witness dies, triggering Deathrender, putting Gravedigger from your hand onto the battlefield and attaching Deathrender to it.
  3. Gravedigger enters the battlefield, returning Eternal Witness from your graveyard to your hand.
  4. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Eternal Witness' power.
  5. Activate Altar of Dementia by sacrificing Gravedigger.
  6. Gravedigger dies, triggering Deathrender, putting Eternal Witness from your hand onto the battlefield and attaching Deathrender to it.
  7. Eternal Witness enters the battlefield, returning Gravedigger from your graveyard to your hand.
  8. Resolve the Altar of Dementia ability from step 5, causing target player to mill cards equal to Gravedigger's power.
  9. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill.

Jarad, Golgari Lich Lord
0.05% of 3870 decks 2 decks
Meren of Clan Nel Toth
0.01% of 14905 decks 1 decks
Colfenor, the Last Yew
0.10% of 1012 decks 1 decks
High Synergy Cards
Skullclamp
100% of 4 decks +88% synergy
Creatures
Souls of the Lost
100% of 1 decks +99% synergy
Saffi Eriksdotter
100% of 1 decks +98% synergy
Luminous Broodmoth
100% of 1 decks +98% synergy
Knight of Autumn
100% of 1 decks +98% synergy
Good-Fortune Unicorn
100% of 1 decks +97% synergy
Athreos, God of Passage
100% of 1 decks +97% synergy
Yargle and Multani
100% of 1 decks +97% synergy
Suture Priest
100% of 1 decks +97% synergy
Teysa Karlov
100% of 1 decks +95% synergy
Corpse Knight
100% of 1 decks +94% synergy
Cruel Celebrant
100% of 1 decks +92% synergy
Elas il-Kor, Sadistic Pilgrim
100% of 1 decks +88% synergy
Avacyn's Pilgrim
100% of 1 decks +85% synergy
Esper Sentinel
100% of 1 decks +79% synergy
Tormod, the Desecrator
75% of 4 decks +74% synergy
Woodfall Primus
75% of 4 decks +74% synergy
Lord of Extinction
75% of 4 decks +73% synergy
Sakura-Tribe Elder
75% of 4 decks +56% synergy
Haruspex
50% of 2 decks +50% synergy
Melira, Sylvok Outcast
50% of 4 decks +50% synergy
Priest of Gix
50% of 4 decks +50% synergy
Wall of Blood
50% of 4 decks +50% synergy
Golgari Findbroker
50% of 4 decks +49% synergy
Stinkweed Imp
50% of 4 decks +49% synergy
Golgari Grave-Troll
50% of 4 decks +48% synergy
Yavimaya Elder
50% of 4 decks +48% synergy
Protean Hulk
50% of 4 decks +48% synergy
Satyr Wayfinder
50% of 4 decks +48% synergy
Razaketh, the Foulblooded
50% of 4 decks +48% synergy
Pawn of Ulamog
50% of 4 decks +48% synergy
Mikaeus, the Unhallowed
50% of 4 decks +47% synergy
Spore Frog
50% of 4 decks +47% synergy
Meren of Clan Nel Toth
50% of 4 decks +47% synergy
World Shaper
50% of 4 decks +47% synergy
Haywire Mite
50% of 2 decks +46% synergy
Sheoldred, Whispering One
50% of 4 decks +45% synergy
Carrion Feeder
50% of 4 decks +45% synergy
Pitiless Plunderer
50% of 4 decks +42% synergy
Viscera Seer
50% of 4 decks +41% synergy
Avenger of Zendikar
50% of 4 decks +40% synergy
Blood Artist
50% of 4 decks +38% synergy
Elvish Mystic
50% of 4 decks +32% synergy
Blood Bairn
25% of 4 decks +25% synergy
Phyrexian Devourer
25% of 4 decks +25% synergy
Aerie Ouphes
25% of 4 decks +25% synergy
Vengeful Strangler
25% of 4 decks +25% synergy
Rendclaw Trow
25% of 4 decks +25% synergy
Lesser Masticore
25% of 4 decks +25% synergy
Cryptic Trilobite
25% of 4 decks +25% synergy
Mindless Automaton
25% of 4 decks +25% synergy
Instants
Despark
100% of 1 decks +84% synergy
Swords to Plowshares
100% of 1 decks +37% synergy
Hatred
50% of 4 decks +50% synergy
Blinding Fog
25% of 4 decks +25% synergy
Fatal Push
25% of 4 decks +24% synergy
Curtains' Call
25% of 4 decks +24% synergy
Fog
25% of 4 decks +22% synergy
Culling the Weak
25% of 4 decks +21% synergy
Grisly Salvage
25% of 4 decks +20% synergy
Harrow
25% of 4 decks +15% synergy
Village Rites
25% of 4 decks +15% synergy
Vampiric Tutor
25% of 4 decks +7% synergy
Dark Ritual
25% of 4 decks +3% synergy
Assassin's Trophy
25% of 4 decks -5% synergy
Sorceries
Stargaze
100% of 1 decks +99% synergy
Season of Loss
100% of 1 decks +97% synergy
Diresight
100% of 1 decks +97% synergy
Coiling Rebirth
100% of 1 decks +97% synergy
Victimize
75% of 4 decks +63% synergy
Buried Alive
50% of 4 decks +44% synergy
Life's Finale
25% of 4 decks +25% synergy
Call of the Death-Dweller
25% of 4 decks +25% synergy
Hex
25% of 4 decks +24% synergy
Mire in Misery
25% of 4 decks +24% synergy
Threats Undetected
25% of 4 decks +24% synergy
Far Wanderings
25% of 4 decks +24% synergy
Bone Shards
25% of 4 decks +23% synergy
Find // Finality
25% of 4 decks +23% synergy
Life // Death
25% of 4 decks +23% synergy
Jarad's Orders
25% of 4 decks +23% synergy
Decree of Pain
25% of 4 decks +22% synergy
Explosive Vegetation
25% of 4 decks +22% synergy
Splendid Reclamation
25% of 4 decks +21% synergy
Life from the Loam
25% of 4 decks +21% synergy
Dread Return
25% of 4 decks +20% synergy
Read the Bones
25% of 4 decks +17% synergy
Reanimate
25% of 4 decks +9% synergy
Kodama's Reach
25% of 4 decks -7% synergy
Rampant Growth
25% of 4 decks -10% synergy
Cultivate
25% of 4 decks -21% synergy
Utility Artifacts
Ashnod's Altar
75% of 4 decks +67% synergy
Phyrexian Altar
50% of 4 decks +46% synergy
Lightning Greaves
50% of 4 decks +25% synergy
Swiftfoot Boots
50% of 4 decks +22% synergy
Blasting Station
25% of 4 decks +24% synergy
Blade of the Bloodchief
25% of 4 decks +24% synergy
Rhonas's Monument
25% of 4 decks +24% synergy
Altar of the Brood
25% of 4 decks +24% synergy
Conjurer's Closet
25% of 4 decks +23% synergy
Bontu's Monument
25% of 4 decks +23% synergy
Crucible of Worlds
25% of 4 decks +22% synergy
Aetherflux Reservoir
25% of 4 decks +21% synergy
Enchantments
Glorious Anthem
100% of 1 decks +99% synergy
Abzan Ascendancy
100% of 1 decks +98% synergy
Cathars' Crusade
100% of 1 decks +94% synergy
Ripples of Undeath
100% of 1 decks +93% synergy
Dictate of Erebos
50% of 4 decks +46% synergy
Phyrexian Arena
50% of 4 decks +35% synergy
Fallen Ideal
25% of 4 decks +25% synergy
One with the Kami
25% of 4 decks +24% synergy
Helix Pinnacle
25% of 4 decks +24% synergy
Underworld Connections
25% of 4 decks +24% synergy
Abundant Growth
25% of 4 decks +24% synergy
Defense of the Heart
25% of 4 decks +22% synergy
Cryptolith Rite
25% of 4 decks +21% synergy
Phyrexian Reclamation
25% of 4 decks +21% synergy
Kaya's Ghostform
25% of 4 decks +21% synergy
Grave Pact
25% of 4 decks +21% synergy
Black Market
25% of 4 decks +20% synergy
Necropotence
25% of 4 decks +20% synergy
Guardian Project
25% of 4 decks +16% synergy
Doubling Season
25% of 4 decks +16% synergy
Animate Dead
25% of 4 decks +16% synergy
Wild Growth
25% of 4 decks +14% synergy
Utility Lands
Gavony Township
100% of 1 decks +90% synergy
Reliquary Tower
75% of 4 decks +46% synergy
Tranquil Thicket
50% of 4 decks +46% synergy
Urborg, Tomb of Yawgmoth
50% of 4 decks +40% synergy
Svogthos, the Restless Tomb
25% of 4 decks +24% synergy
Polluted Mire
25% of 4 decks +24% synergy
Dark Depths
25% of 4 decks +24% synergy
Hissing Quagmire
25% of 4 decks +24% synergy
Field of Ruin
25% of 4 decks +23% synergy
Thespian's Stage
25% of 4 decks +22% synergy
High Market
25% of 4 decks +22% synergy
Geier Reach Sanitarium
25% of 4 decks +22% synergy
Barren Moor
25% of 4 decks +21% synergy
Grim Backwoods
25% of 4 decks +21% synergy
Dryad Arbor
25% of 4 decks +21% synergy
Mortuary Mire
25% of 4 decks +20% synergy
Buried Ruin
25% of 4 decks +20% synergy
Castle Locthwain
25% of 4 decks +20% synergy
Nykthos, Shrine to Nyx
25% of 4 decks +19% synergy
Phyrexian Tower
25% of 4 decks +17% synergy
Bojuka Bog
25% of 4 decks -5% synergy
Mana Artifacts
Golgari Signet
75% of 4 decks +62% synergy
Sol Ring
75% of 4 decks -9% synergy
Talisman of Resilience
50% of 4 decks +38% synergy
Arcane Signet
50% of 4 decks -22% synergy
Golgari Locket
25% of 4 decks +25% synergy
Lands
Temple of Plenty
100% of 1 decks +87% synergy
Underground Mortuary
100% of 1 decks +83% synergy
Temple of Silence
100% of 1 decks +82% synergy
Sandsteppe Citadel
100% of 1 decks +74% synergy
Woodland Cemetery
100% of 4 decks +72% synergy
Command Tower
100% of 4 decks +26% synergy
Jungle Hollow
75% of 4 decks +66% synergy
Golgari Rot Farm
75% of 4 decks +57% synergy
Evolving Wilds
75% of 4 decks +54% synergy
Twilight Mire
50% of 4 decks +40% synergy
Tainted Wood
50% of 4 decks +37% synergy
Temple of Malady
50% of 4 decks +34% synergy
Llanowar Wastes
50% of 4 decks +24% synergy
Undergrowth Stadium
50% of 4 decks +24% synergy
Overgrown Tomb
50% of 4 decks +7% synergy
Darkmoss Bridge
25% of 4 decks +22% synergy
Ash Barrens
25% of 4 decks +20% synergy
Darkbore Pathway
25% of 4 decks +16% synergy
Verdant Catacombs
25% of 4 decks +14% synergy
Necroblossom Snarl
25% of 4 decks +13% synergy
Deathcap Glade
25% of 4 decks +11% synergy
Myriad Landscape
25% of 4 decks +5% synergy