Retribution of the Ancients + Phyrexian Altar + Evernight Shade

Retribution of the Ancients
Phyrexian Altar
Evernight Shade

Requires
Retribution of the Ancients must be on the battlefield. Phyrexian Altar must be on the battlefield. Evernight Shade must be on the battlefield. Evernight Shade has no +1/+1 counters on it.
Steps
  1. Activate Phyrexian Altar by sacrificing Evernight Shade, adding .
  2. Evernight Shade dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. Activate Retribution of the Ancients by paying and removing a +1/+1 counter from Evernight Shade, giving any creature -1/-1 until end of turn.
  4. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Reduce any number of target creatures' toughness to zero.

Yawgmoth, Thran Physician
0.09% of 5567 decks 5 decks
Elas il-Kor, Sadistic Pilgrim
0.05% of 6454 decks 3 decks
Ghave, Guru of Spores
0.03% of 6423 decks 2 decks
Kresh the Bloodbraided
0.04% of 2663 decks 1 decks
Marchesa, the Black Rose
0.01% of 9321 decks 1 decks
High Synergy Cards
Sightless Ghoul
92% of 12 decks +92% synergy
Pitiless Plunderer
83% of 12 decks +76% synergy
Butcher Ghoul
75% of 12 decks +75% synergy
Geralf's Messenger
75% of 12 decks +75% synergy
Ashnod's Altar
75% of 12 decks +67% synergy
Viscera Seer
75% of 12 decks +66% synergy
Gravecrawler
67% of 12 decks +64% synergy
Zulaport Cutthroat
58% of 12 decks +48% synergy
Pawn of Ulamog
50% of 12 decks +48% synergy
Mikaeus, the Unhallowed
50% of 12 decks +47% synergy
Top Cards
Dark Ritual
58% of 12 decks +36% synergy
Reassembling Skeleton
50% of 12 decks +46% synergy
Grim Haruspex
50% of 12 decks +46% synergy
Blood Artist
50% of 12 decks +38% synergy
Putrid Goblin
42% of 12 decks +41% synergy
Shambling Ghast
42% of 12 decks +41% synergy
Carrion Feeder
42% of 12 decks +37% synergy
Bastion of Remembrance
42% of 12 decks +35% synergy
Gray Merchant of Asphodel
42% of 12 decks +33% synergy
Bolas's Citadel
42% of 12 decks +32% synergy
Creatures
Strangleroot Geist
100% of 3 decks +100% synergy
Young Wolf
100% of 3 decks +100% synergy
Twilight Shepherd
60% of 5 decks +60% synergy
Lesser Masticore
33% of 12 decks +33% synergy
Deathgreeter
33% of 12 decks +33% synergy
Lingering Tormentor
25% of 12 decks +25% synergy
Persistent Specimen
25% of 12 decks +24% synergy
Nether Traitor
25% of 12 decks +24% synergy
Puppeteer Clique
25% of 12 decks +23% synergy
Walking Ballista
25% of 12 decks +22% synergy
Fleshbag Marauder
25% of 12 decks +21% synergy
Plaguecrafter
25% of 12 decks +20% synergy
Instants
Vampiric Tutor
58% of 12 decks +40% synergy
Village Rites
42% of 12 decks +32% synergy
Deadly Rollick
33% of 12 decks +23% synergy
Tragic Slip
25% of 12 decks +21% synergy
Malakir Rebirth
25% of 12 decks +17% synergy
Deadly Dispute
25% of 12 decks +14% synergy
Sorceries
Farseek
100% of 3 decks +66% synergy
Rampant Growth
100% of 3 decks +65% synergy
Sign in Blood
42% of 12 decks +32% synergy
Demonic Tutor
42% of 12 decks +19% synergy
Unearth
33% of 12 decks +30% synergy
Diabolic Tutor
33% of 12 decks +27% synergy
Final Parting
25% of 12 decks +23% synergy
Read the Bones
25% of 12 decks +17% synergy
Victimize
25% of 12 decks +13% synergy
Reanimate
25% of 12 decks +9% synergy
Feed the Swarm
25% of 12 decks +7% synergy
Utility Artifacts
Skullclamp
33% of 12 decks +21% synergy
Cauldron of Souls
25% of 12 decks +24% synergy
Blasting Station
25% of 12 decks +24% synergy
Expedition Map
25% of 12 decks +22% synergy
The Ozolith
25% of 12 decks +22% synergy
Enchantments
Solemnity
60% of 5 decks +59% synergy
Thran Vigil
40% of 10 decks +39% synergy
Nest of Scarabs
33% of 12 decks +33% synergy
Phyrexian Arena
33% of 12 decks +19% synergy
Dictate of Erebos
25% of 12 decks +21% synergy
Grave Pact
25% of 12 decks +21% synergy
Black Market
25% of 12 decks +20% synergy
Utility Lands
Phyrexian Tower
42% of 12 decks +33% synergy
Cabal Coffers
42% of 12 decks +31% synergy
Witch's Cottage
33% of 12 decks +30% synergy
Urborg, Tomb of Yawgmoth
33% of 12 decks +23% synergy
Ancient Tomb
33% of 12 decks +23% synergy
Volrath's Stronghold
25% of 12 decks +24% synergy
Thespian's Stage
25% of 12 decks +22% synergy
Karn's Bastion
25% of 12 decks +20% synergy
Nykthos, Shrine to Nyx
25% of 12 decks +19% synergy
Reliquary Tower
25% of 12 decks -4% synergy
Mana Artifacts
Sol Ring
92% of 12 decks +7% synergy
Arcane Signet
83% of 12 decks +11% synergy
Marble Diamond
60% of 5 decks +56% synergy
Charcoal Diamond
33% of 12 decks +28% synergy
Commander's Sphere
33% of 12 decks +18% synergy
Fellwar Stone
33% of 12 decks +12% synergy
Energy Refractor
30% of 10 decks +30% synergy
Prismatic Lens
25% of 12 decks +24% synergy
Everflowing Chalice
25% of 12 decks +20% synergy
Mind Stone
25% of 12 decks +8% synergy
Lands
Caves of Koilos
60% of 5 decks +32% synergy
Command Tower
42% of 12 decks -32% synergy