Retribution of the Ancients + Phyrexian Altar + Howlgeist

Retribution of the Ancients
Phyrexian Altar
Howlgeist

Requires
Retribution of the Ancients must be on the battlefield. Phyrexian Altar must be on the battlefield. Howlgeist must be on the battlefield. Howlgeist has no +1/+1 counters on it.
Steps
  1. Activate Phyrexian Altar by sacrificing Howlgeist, adding .
  2. Howlgeist 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 Howlgeist, 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.

Kresh the Bloodbraided
0.04% of 2663 decks 1 decks
Ghave, Guru of Spores
0.02% of 6423 decks 1 decks
Creatures
Nearheath Stalker
100% of 1 decks +100% synergy
Restless Apparition
100% of 1 decks +100% synergy
Lingering Tormentor
100% of 2 decks +100% synergy
Hound of Griselbrand
100% of 1 decks +100% synergy
Sightless Ghoul
100% of 2 decks +100% synergy
Evernight Shade
100% of 2 decks +100% synergy
Safehold Elite
100% of 1 decks +100% synergy
Twilight Shepherd
100% of 1 decks +100% synergy
Strangleroot Geist
100% of 2 decks +100% synergy
Pyreheart Wolf
100% of 1 decks +100% synergy
Vorapede
100% of 2 decks +100% synergy
Butcher Ghoul
100% of 2 decks +100% synergy
Young Wolf
100% of 2 decks +100% synergy
Kitchen Finks
100% of 1 decks +100% synergy
Putrid Goblin
100% of 2 decks +99% synergy
Flayer of the Hatebound
100% of 1 decks +99% synergy
Murderous Redcap
100% of 1 decks +99% synergy
Juniper Order Ranger
100% of 1 decks +98% synergy
Lagomos, Hand of Hatred
100% of 1 decks +97% synergy
Yargle and Multani
100% of 1 decks +97% synergy
Anger
100% of 1 decks +94% synergy
Mahadi, Emporium Master
100% of 1 decks +93% synergy
Sun Titan
100% of 1 decks +89% synergy
Vengeful Vampire
50% of 2 decks +50% synergy
Demonlord of Ashmouth
50% of 2 decks +50% synergy
Treacherous Pit-Dweller
50% of 2 decks +50% synergy
Aetherborn Marauder
50% of 2 decks +50% synergy
Aerie Ouphes
50% of 2 decks +50% synergy
Endling
50% of 2 decks +50% synergy
Rendclaw Trow
50% of 2 decks +50% synergy
Cryptic Trilobite
50% of 2 decks +50% synergy
Krav, the Unredeemed
50% of 2 decks +50% synergy
Geralf's Messenger
50% of 2 decks +50% synergy
Bloodspore Thrinax
50% of 2 decks +50% synergy
Hierophant Bio-Titan
50% of 2 decks +50% synergy
Smothering Abomination
50% of 2 decks +49% synergy
Puppeteer Clique
50% of 2 decks +48% synergy
Brawn
50% of 2 decks +48% synergy
Pawn of Ulamog
50% of 2 decks +48% synergy
Fertilid
50% of 2 decks +48% synergy
Gravecrawler
50% of 2 decks +47% synergy
Mikaeus, the Unhallowed
50% of 2 decks +47% synergy
Sheoldred, Whispering One
50% of 2 decks +45% synergy
Carrion Feeder
50% of 2 decks +45% synergy
Champion of Lambholt
50% of 2 decks +43% synergy
Pitiless Plunderer
50% of 2 decks +42% synergy
Braids, Arisen Nightmare
50% of 2 decks +42% synergy
Viscera Seer
50% of 2 decks +41% synergy
Instants
Corrupted Conviction
100% of 1 decks +94% synergy
Entish Restoration
100% of 1 decks +92% synergy
Village Rites
100% of 2 decks +90% synergy
Deadly Dispute
100% of 2 decks +89% synergy
Anguished Unmaking
100% of 1 decks +76% synergy
Swords to Plowshares
100% of 1 decks +37% synergy
Momentous Fall
50% of 2 decks +48% synergy
Plumb the Forbidden
50% of 2 decks +47% synergy
Inspiring Call
50% of 2 decks +42% synergy
Harrow
50% of 2 decks +40% synergy
Return of the Wildspeaker
50% of 2 decks +37% synergy
Worldly Tutor
50% of 2 decks +36% synergy
Vampiric Tutor
50% of 2 decks +32% synergy
Dark Ritual
50% of 2 decks +28% synergy
Assassin's Trophy
50% of 2 decks +20% synergy
Sorceries
Damn
100% of 1 decks +83% synergy
Three Visits
100% of 2 decks +75% synergy
Farseek
100% of 2 decks +66% synergy
Rampant Growth
100% of 2 decks +65% synergy
Primal Growth
50% of 2 decks +49% synergy
Reshape the Earth
50% of 2 decks +48% synergy
Dig Up
50% of 2 decks +47% synergy
Grim Tutor
50% of 2 decks +45% synergy
Diabolic Tutor
50% of 2 decks +44% synergy
Damnation
50% of 2 decks +42% synergy
Rishkar's Expertise
50% of 2 decks +40% synergy
Demonic Tutor
50% of 2 decks +28% synergy
Kodama's Reach
50% of 2 decks +18% synergy
Nature's Lore
50% of 2 decks +18% synergy
Utility Artifacts
Cauldron of Souls
100% of 2 decks +99% synergy
The Ozolith
100% of 2 decks +97% synergy
Mithril Coat
100% of 1 decks +94% synergy
Ashnod's Altar
100% of 2 decks +92% synergy
Defense Grid
50% of 2 decks +49% synergy
Eldrazi Monument
50% of 2 decks +49% synergy
Mask of Griselbrand
50% of 2 decks +49% synergy
Darksteel Plate
50% of 2 decks +48% synergy
Birthing Pod
50% of 2 decks +47% synergy
Swiftfoot Boots
50% of 2 decks +22% synergy
Enchantments
Stranglehold
100% of 1 decks +99% synergy
Price of Glory
100% of 1 decks +99% synergy
Together Forever
100% of 1 decks +99% synergy
Cathars' Crusade
100% of 1 decks +94% synergy
Phyrexian Arena
100% of 2 decks +85% synergy
City of Solitude
50% of 2 decks +50% synergy
Thran Vigil
50% of 2 decks +49% synergy
Fecundity
50% of 2 decks +49% synergy
Mana Reflection
50% of 2 decks +48% synergy
No Mercy
50% of 2 decks +48% synergy
Asceticism
50% of 2 decks +47% synergy
Wilderness Reclamation
50% of 2 decks +46% synergy
Moldervine Reclamation
50% of 2 decks +41% synergy
Planeswalkers
Vraska, Golgari Queen
50% of 2 decks +47% synergy
Utility Lands
Phyrexian Tower
100% of 2 decks +92% synergy
Gavony Township
100% of 1 decks +90% synergy
Grim Backwoods
50% of 2 decks +46% synergy
Karn's Bastion
50% of 2 decks +45% synergy
Temple of the False God
50% of 2 decks +40% synergy
Ancient Tomb
50% of 2 decks +39% synergy
Boseiju, Who Endures
50% of 2 decks +30% synergy
Reliquary Tower
50% of 2 decks +21% synergy
Mana Artifacts
Sol Ring
100% of 2 decks +16% synergy
Mox Opal
50% of 2 decks +46% synergy
Mana Crypt
50% of 2 decks +41% synergy
Commander's Sphere
50% of 2 decks +35% synergy
Arcane Signet
50% of 2 decks -22% synergy
Lands
Sandsteppe Citadel
100% of 1 decks +74% synergy
Indatha Triome
100% of 1 decks +69% synergy
Marsh Flats
50% of 2 decks +39% synergy
Terramorphic Expanse
50% of 2 decks +34% synergy
Evolving Wilds
50% of 2 decks +29% synergy
Woodland Cemetery
50% of 2 decks +22% synergy
Exotic Orchard
50% of 2 decks +14% synergy
Command Tower
50% of 2 decks -24% synergy