Deathrender + Gravedigger + Eternal Witness + Ashnod's Altar

Deathrender
Gravedigger
Eternal Witness
Ashnod's Altar

Requires
Deathrender must be on the battlefield. Gravedigger must be in hand. Eternal Witness must be on the battlefield. Ashnod's Altar must be on the battlefield. Deathrender attached to Eternal Witness.
Steps
  1. Activate Ashnod's Altar by sacrificing Eternal Witness, adding .
  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. Activate Ashnod's Altar by sacrificing Gravedigger, adding .
  5. Gravedigger dies, triggering Deathrender, putting Eternal Witness from your hand onto the battlefield and attaching Deathrender to it.
  6. Eternal Witness enters the battlefield, returning Gravedigger from your graveyard to your hand.
  7. Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

Jarad, Golgari Lich Lord
0.05% of 3870 decks 2 decks
Colfenor, the Last Yew
0.10% of 1012 decks 1 decks
Sivriss, Nightmare Speaker // Cloakwood Hermit
0.13% of 798 decks 1 decks
Creatures
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
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
Meren of Clan Nel Toth
75% of 4 decks +72% synergy
Mindless Automaton
50% of 4 decks +50% synergy
Priest of Gix
50% of 4 decks +50% synergy
Wall of Blood
50% of 4 decks +50% synergy
Souls of the Lost
50% of 2 decks +49% synergy
Mortivore
50% of 4 decks +49% synergy
Golgari Findbroker
50% of 4 decks +49% synergy
Skullwinder
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
The Mycotyrant
50% of 2 decks +48% synergy
Lord of Extinction
50% of 4 decks +48% synergy
Brawn
50% of 4 decks +48% synergy
Satyr Wayfinder
50% of 4 decks +48% synergy
Razaketh, the Foulblooded
50% of 4 decks +48% synergy
Izoni, Thousand-Eyed
50% of 4 decks +48% synergy
World Shaper
50% of 4 decks +47% synergy
Yargle and Multani
50% of 2 decks +47% synergy
Sheoldred, Whispering One
50% of 4 decks +45% synergy
Carrion Feeder
50% of 4 decks +45% synergy
Wood Elves
50% of 4 decks +43% synergy
Pitiless Plunderer
50% of 4 decks +42% synergy
Avenger of Zendikar
50% of 4 decks +40% synergy
Elvish Mystic
50% of 4 decks +32% synergy
Sakura-Tribe Elder
50% of 4 decks +31% synergy
Haruspex
33% of 3 decks +33% synergy
Haywire Mite
33% of 3 decks +29% synergy
Hag Hedge-Mage
25% of 4 decks +25% synergy
Pit Keeper
25% of 4 decks +25% synergy
Liege of the Hollows
25% of 4 decks +25% synergy
Phyrexian Devourer
25% of 4 decks +25% synergy
Treasure Keeper
25% of 4 decks +25% synergy
Cryptic Trilobite
25% of 4 decks +25% synergy
Melira, Sylvok Outcast
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
Fog
25% of 4 decks +22% 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
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
Dread Return
50% of 4 decks +45% synergy
Buried Alive
50% of 4 decks +44% synergy
Victimize
50% of 4 decks +38% synergy
Reanimate
50% of 4 decks +34% synergy
Far Wanderings
25% of 4 decks +24% synergy
Jarad's Orders
25% of 4 decks +23% 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
Living Death
25% of 4 decks +20% 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
Altar of Dementia
75% of 4 decks +72% synergy
Skullclamp
75% of 4 decks +63% synergy
Vat of Rebirth
50% of 2 decks +48% synergy
Phyrexian Altar
50% of 4 decks +46% synergy
Conduit of Worlds
50% of 2 decks +43% synergy
Lightning Greaves
50% of 4 decks +25% synergy
Swiftfoot Boots
50% of 4 decks +22% synergy
Inscribed Tablet
25% of 4 decks +25% synergy
Blasting Station
25% of 4 decks +24% synergy
Executioner's Capsule
25% of 4 decks +24% synergy
Thornbite Staff
25% of 4 decks +24% synergy
Chitterspitter
25% of 4 decks +24% synergy
Altar of the Brood
25% of 4 decks +24% synergy
Moonsilver Key
25% of 4 decks +24% synergy
Crucible of Worlds
25% of 4 decks +22% synergy
Aetherflux Reservoir
25% of 4 decks +21% synergy
Wayfarer's Bauble
25% of 4 decks +15% 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
Chalk Outline
50% of 2 decks +50% synergy
Dictate of Erebos
50% of 4 decks +46% synergy
Grave Pact
50% of 4 decks +46% synergy
Insidious Roots
50% of 2 decks +41% synergy
Animate Dead
50% of 4 decks +41% synergy
Phyrexian Arena
50% of 4 decks +35% synergy
Strands of Night
25% of 4 decks +25% synergy
One with the Kami
25% of 4 decks +24% synergy
Earthcraft
25% of 4 decks +24% synergy
Fecundity
25% of 4 decks +24% synergy
Underworld Connections
25% of 4 decks +24% synergy
Squirrel Nest
25% of 4 decks +24% synergy
Tortured Existence
25% of 4 decks +23% synergy
Oversold Cemetery
25% of 4 decks +23% synergy
Necromancy
25% of 4 decks +22% synergy
Journey to Eternity
25% of 4 decks +22% synergy
Cryptolith Rite
25% of 4 decks +21% synergy
Phyrexian Reclamation
25% of 4 decks +21% synergy
Black Market
25% of 4 decks +20% synergy
Greater Good
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
Planeswalkers
Liliana, the Last Hope
25% of 4 decks +24% synergy
Vraska, Golgari Queen
25% of 4 decks +22% synergy
Utility Lands
Gavony Township
100% of 1 decks +90% synergy
Tranquil Thicket
50% of 4 decks +46% synergy
Urborg, Tomb of Yawgmoth
50% of 4 decks +40% synergy
Reliquary Tower
50% of 4 decks +21% 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
Volrath's Stronghold
25% of 4 decks +24% synergy
Field of Ruin
25% of 4 decks +23% synergy
Thespian's Stage
25% of 4 decks +22% synergy
Maze of Ith
25% of 4 decks +22% synergy
High Market
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
Sol Ring
75% of 4 decks -9% synergy
Talisman of Resilience
50% of 4 decks +38% synergy
Golgari Signet
50% of 4 decks +37% 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 2 decks +83% synergy
Temple of Silence
100% of 1 decks +82% synergy
Sandsteppe Citadel
100% of 1 decks +74% synergy
Woodland Cemetery
75% of 4 decks +47% synergy
Overgrown Tomb
75% of 4 decks +32% synergy
Command Tower
75% of 4 decks +1% synergy
Jungle Hollow
50% of 4 decks +41% synergy
Twilight Mire
50% of 4 decks +40% synergy
Verdant Catacombs
50% of 4 decks +39% synergy
Tainted Wood
50% of 4 decks +37% synergy
Temple of Malady
50% of 4 decks +34% synergy
Golgari Rot Farm
50% of 4 decks +32% synergy
Evolving Wilds
50% of 4 decks +29% synergy
Llanowar Wastes
50% of 4 decks +24% synergy
Riveteers Overlook
25% of 4 decks +23% synergy
Ash Barrens
25% of 4 decks +20% synergy
Woodland Chasm
25% of 4 decks +20% synergy
Haunted Mire
25% of 4 decks +17% synergy
Necroblossom Snarl
25% of 4 decks +13% synergy
Bayou
25% of 4 decks +11% synergy
Deathcap Glade
25% of 4 decks +11% synergy
Myriad Landscape
25% of 4 decks +5% synergy
Undergrowth Stadium
25% of 4 decks -1% synergy