Cauldron of Souls + Corridor Monitor + Cathars' Crusade + Phyrexian Altar

Cauldron of Souls
Corridor Monitor
Cathars' Crusade
Phyrexian Altar

Requires
Cauldron of Souls must be on the battlefield. Corridor Monitor must be on the battlefield. Cathars' Crusade must be on the battlefield. Phyrexian Altar must be on the battlefield. Corridor Monitor does not have a -1/-1 counter on it.
Steps
  1. Activate Cauldron of Souls by tapping it, giving Corridor Monitor persist until end of turn.
  2. Activate Phyrexian Altar by sacrificing Corridor Monitor, adding one mana of any color.
  3. When Corridor Monitor dies, its persist ability triggers, returning itself from your graveyard to the battlefield with a -1/-1 counter on it.
  4. When Corridor Monitor enters the battlefield, it and Cathars' Crusade trigger.
  5. Resolve the Corridor Monitor trigger, untapping Cauldron of Souls.
  6. Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control.
  7. Repeat.
Results
Infinite colored mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite +1/+1 counters.

Cayth, Famed Mechanist
0.08% of 1315 decks 1 decks
Reaper King
0.02% of 5423 decks 1 decks
Creatures
Changeling Titan
100% of 1 decks +100% synergy
Mikaeus, the Unhallowed
100% of 1 decks +97% synergy
Kithkin Spellduster
50% of 2 decks +50% synergy
Antler Skulkin
50% of 2 decks +50% synergy
Scorched Rusalka
50% of 2 decks +50% synergy
Tatterkite
50% of 2 decks +50% synergy
Rattleblaze Scarecrow
50% of 2 decks +50% synergy
Pyre-Sledge Arsonist
50% of 2 decks +50% synergy
Furystoke Giant
50% of 2 decks +50% synergy
Wingrattle Scarecrow
50% of 2 decks +50% synergy
Changeling Hero
50% of 2 decks +50% synergy
Blood Aspirant
50% of 2 decks +50% synergy
Lesser Masticore
50% of 2 decks +50% synergy
Twilight Shepherd
50% of 2 decks +50% synergy
Thunderblust
50% of 2 decks +50% synergy
Dross Scorpion
50% of 2 decks +50% synergy
Changeling Berserker
50% of 2 decks +50% synergy
Painter's Servant
50% of 2 decks +50% synergy
Scarecrone
50% of 2 decks +50% synergy
Pili-Pala
50% of 2 decks +50% synergy
Thermopod
50% of 2 decks +50% synergy
Grand Architect
50% of 2 decks +49% synergy
River Kelpie
50% of 2 decks +49% synergy
Circuit Mender
50% of 2 decks +49% synergy
Rose Room Treasurer
50% of 2 decks +49% synergy
Metallic Mimic
50% of 2 decks +49% synergy
Zoanthrope
50% of 2 decks +48% synergy
Luminous Broodmoth
50% of 2 decks +48% synergy
Glen Elendra Archmage
50% of 2 decks +48% synergy
Walking Ballista
50% of 2 decks +47% synergy
Witty Roastmaster
50% of 2 decks +47% synergy
Purphoros, God of the Forge
50% of 2 decks +45% synergy
Displacer Kitten
50% of 2 decks +44% synergy
Mulldrifter
50% of 2 decks +44% synergy
Archivist of Oghma
50% of 2 decks +44% synergy
Faerie Mastermind
50% of 2 decks +43% synergy
Niv-Mizzet, Parun
50% of 2 decks +42% synergy
Esper Sentinel
50% of 2 decks +29% synergy
Instants
Mystical Teachings
100% of 1 decks +100% synergy
Mana Drain
100% of 2 decks +85% synergy
Beast Within
100% of 1 decks +61% synergy
Counterspell
100% of 2 decks +57% synergy
Path to Exile
100% of 2 decks +55% synergy
Swords to Plowshares
100% of 2 decks +37% synergy
Collateral Damage
50% of 2 decks +50% synergy
First Day of Class
50% of 2 decks +50% synergy
Shelter
50% of 2 decks +49% synergy
Aurelia's Fury
50% of 2 decks +49% synergy
Cryptic Command
50% of 2 decks +48% synergy
Fling
50% of 2 decks +48% synergy
Cloudshift
50% of 2 decks +47% synergy
Ephemerate
50% of 2 decks +44% synergy
Consider
50% of 2 decks +44% synergy
Force of Negation
50% of 2 decks +41% synergy
Rapid Hybridization
50% of 2 decks +41% synergy
Opt
50% of 2 decks +40% synergy
Flawless Maneuver
50% of 2 decks +40% synergy
Force of Will
50% of 2 decks +39% synergy
Mystical Tutor
50% of 2 decks +35% synergy
Deflecting Swat
50% of 2 decks +34% synergy
Enlightened Tutor
50% of 2 decks +32% synergy
Generous Gift
50% of 2 decks +24% synergy
Cyclonic Rift
50% of 2 decks +22% synergy
Chaos Warp
50% of 2 decks +18% synergy
Sorceries
Deathbellow War Cry
50% of 2 decks +50% synergy
Blaze
50% of 2 decks +50% synergy
Fireball
50% of 2 decks +49% synergy
Banefire
50% of 2 decks +49% synergy
Personal Tutor
50% of 2 decks +49% synergy
Crackle with Power
50% of 2 decks +48% synergy
Rite of Replication
50% of 2 decks +47% synergy
Serum Visions
50% of 2 decks +46% synergy
Fabricate
50% of 2 decks +44% synergy
Preordain
50% of 2 decks +39% synergy
Farewell
50% of 2 decks +37% synergy
Faithless Looting
50% of 2 decks +33% synergy
Blasphemous Act
50% of 2 decks +16% synergy
Utility Artifacts
Ashnod's Altar
100% of 2 decks +92% synergy
The One Ring
100% of 2 decks +91% synergy
The Great Henge
100% of 1 decks +90% synergy
Grindstone
50% of 2 decks +50% synergy
The Golden Throne
50% of 2 decks +49% synergy
Blasting Station
50% of 2 decks +49% synergy
Voltaic Key
50% of 2 decks +49% synergy
Amulet of Vigor
50% of 2 decks +49% synergy
Eldrazi Monument
50% of 2 decks +49% synergy
Altar of Dementia
50% of 2 decks +47% synergy
Enchantments
Warleader's Call
100% of 1 decks +89% synergy
Rhystic Study
100% of 2 decks +72% synergy
Pandemonium
50% of 2 decks +50% synergy
Martyr's Cause
50% of 2 decks +49% synergy
Solemnity
50% of 2 decks +49% synergy
Storm the Vault
50% of 2 decks +47% synergy
Goblin Bombardment
50% of 2 decks +44% synergy
Impact Tremors
50% of 2 decks +41% synergy
Mystic Remora
50% of 2 decks +32% synergy
Utility Lands
Dark Depths
50% of 2 decks +49% synergy
Arcane Lighthouse
50% of 2 decks +49% synergy
Thespian's Stage
50% of 2 decks +47% synergy
Reliquary Tower
50% of 2 decks +21% synergy
Mana Artifacts
Talisman of Unity
100% of 1 decks +93% synergy
Talisman of Impulse
100% of 1 decks +91% synergy
Talisman of Resilience
100% of 1 decks +88% synergy
Talisman of Curiosity
100% of 1 decks +88% synergy
Timeless Lotus
100% of 1 decks +86% synergy
Talisman of Hierarchy
100% of 1 decks +75% synergy
Talisman of Indulgence
100% of 1 decks +74% synergy
Talisman of Dominance
100% of 1 decks +69% synergy
Sol Ring
100% of 2 decks +16% synergy
Mana Vault
50% of 2 decks +44% synergy
Talisman of Progress
50% of 2 decks +27% synergy
Talisman of Conviction
50% of 2 decks +27% synergy
Talisman of Creativity
50% of 2 decks +21% synergy
Lands
Reflecting Pool
100% of 2 decks +95% synergy
Elegant Parlor
100% of 1 decks +91% synergy
Meticulous Archive
100% of 1 decks +90% synergy
Thundering Falls
100% of 1 decks +89% synergy
Savannah
100% of 1 decks +87% synergy
Taiga
100% of 1 decks +87% synergy
Badlands
100% of 1 decks +86% synergy
Bayou
100% of 1 decks +86% synergy
Scrubland
100% of 1 decks +86% synergy
Tropical Island
100% of 1 decks +86% synergy
Underground Sea
100% of 1 decks +86% synergy
Bountiful Promenade
100% of 1 decks +76% synergy
Spire Garden
100% of 1 decks +76% synergy
Spectator Seating
100% of 2 decks +75% synergy
Vault of Champions
100% of 1 decks +74% synergy
Sea of Clouds
100% of 2 decks +74% synergy
Morphic Pool
100% of 1 decks +74% synergy
Undergrowth Stadium
100% of 1 decks +74% synergy
Luxury Suite
100% of 1 decks +74% synergy
Training Center
100% of 2 decks +72% synergy
Rejuvenating Springs
100% of 1 decks +71% synergy
Sacred Foundry
100% of 2 decks +64% synergy
Blood Crypt
100% of 1 decks +61% synergy
Steam Vents
100% of 2 decks +61% synergy
Temple Garden
100% of 1 decks +59% synergy
Godless Shrine
100% of 1 decks +59% synergy
Watery Grave
100% of 1 decks +59% synergy
Hallowed Fountain
100% of 2 decks +59% synergy
Breeding Pool
100% of 1 decks +59% synergy
Stomping Ground
100% of 1 decks +59% synergy
Overgrown Tomb
100% of 1 decks +57% synergy
Command Tower
100% of 2 decks +26% synergy
Spirebluff Canal
50% of 2 decks +47% synergy
Plaza of Heroes
50% of 2 decks +47% synergy
Seachrome Coast
50% of 2 decks +45% synergy
Nimbus Maze
50% of 2 decks +45% synergy
Mana Confluence
50% of 2 decks +43% synergy
City of Brass
50% of 2 decks +42% synergy
Flooded Strand
50% of 2 decks +39% synergy
Arid Mesa
50% of 2 decks +39% synergy
Scalding Tarn
50% of 2 decks +39% synergy
Plateau
50% of 2 decks +37% synergy
Volcanic Island
50% of 2 decks +36% synergy
Tundra
50% of 2 decks +36% synergy
Sundown Pass
50% of 2 decks +35% synergy
Deserted Beach
50% of 2 decks +34% synergy
Stormcarved Coast
50% of 2 decks +33% synergy
Glacial Fortress
50% of 2 decks +25% synergy
Mystic Monastery
50% of 2 decks +24% synergy
Raugrin Triome
50% of 2 decks +23% synergy