Cauldron of Souls
Corridor Monitor
Cathars' Crusade
Ashnod's Altar

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.
Corridor Monitor does not have a -1/-1 counter on it.

   Steps

How does this combo work?
1
Activate Cauldron of Souls by tapping it, giving Corridor Monitor persist until end of turn.
2
Activate Ashnod's Altar by sacrificing Corridor Monitor, adding .
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

What do I get from this combo?
Infinite colorless mana
Infinite death triggers
Infinite ETB
Infinite LTB
Infinite sacrifice triggers
Infinite +1/+1 counters
Reaper King
0.0%inclusion2 decks7.10K decks
Cayth, Famed Mechanist
0.0%inclusion1 decks3.84K decks
Creatures
Changeling Titan
100%inclusion2 decks2 decks
100%synergy
Metallic Mimic
67%inclusion2 decks3 decks
65%synergy
Grand Architect
67%inclusion2 decks3 decks
66%synergy
Changeling Hero
67%inclusion2 decks3 decks
67%synergy
Changeling Berserker
67%inclusion2 decks3 decks
67%synergy
Pili-Pala
67%inclusion2 decks3 decks
66%synergy
Luminous Broodmoth
67%inclusion2 decks3 decks
64%synergy
Scarecrone
67%inclusion2 decks3 decks
66%synergy
Painter's Servant
67%inclusion2 decks3 decks
66%synergy
Antler Skulkin
67%inclusion2 decks3 decks
67%synergy
Rattleblaze Scarecrow
67%inclusion2 decks3 decks
67%synergy
Tatterkite
67%inclusion2 decks3 decks
67%synergy
Wingrattle Scarecrow
67%inclusion2 decks3 decks
67%synergy
Good-Fortune Unicorn
50%inclusion1 decks2 decks
48%synergy
Maw of the Obzedat
50%inclusion1 decks2 decks
50%synergy
Realmwalker
50%inclusion1 decks2 decks
45%synergy
Three Tree Mascot
50%inclusion1 decks2 decks
50%synergy
Mikaeus, the Unhallowed
50%inclusion1 decks2 decks
48%synergy
Scuttlemutt
33%inclusion1 decks3 decks
33%synergy
Clone
33%inclusion1 decks3 decks
32%synergy
Scaretiller
33%inclusion1 decks3 decks
33%synergy
Wild-Field Scarecrow
33%inclusion1 decks3 decks
33%synergy
Spark Double
33%inclusion1 decks3 decks
27%synergy
Scrapbasket
33%inclusion1 decks3 decks
33%synergy
Bloodline Pretender
33%inclusion1 decks3 decks
32%synergy
Mulldrifter
33%inclusion1 decks3 decks
29%synergy
Purphoros, God of the Forge
33%inclusion1 decks3 decks
29%synergy
Walking Ballista
33%inclusion1 decks3 decks
31%synergy
River Kelpie
33%inclusion1 decks3 decks
32%synergy
Twilight Shepherd
33%inclusion1 decks3 decks
33%synergy
Glen Elendra Archmage
33%inclusion1 decks3 decks
31%synergy
Niv-Mizzet, Parun
33%inclusion1 decks3 decks
26%synergy
Scorched Rusalka
33%inclusion1 decks3 decks
33%synergy
Thermopod
33%inclusion1 decks3 decks
33%synergy
Lesser Masticore
33%inclusion1 decks3 decks
33%synergy
Thunderblust
33%inclusion1 decks3 decks
33%synergy
Blood Aspirant
33%inclusion1 decks3 decks
33%synergy
Kithkin Spellduster
33%inclusion1 decks3 decks
33%synergy
Furystoke Giant
33%inclusion1 decks3 decks
33%synergy
Dross Scorpion
33%inclusion1 decks3 decks
33%synergy
Circuit Mender
33%inclusion1 decks3 decks
33%synergy
Pyre-Sledge Arsonist
33%inclusion1 decks3 decks
33%synergy
Witty Roastmaster
33%inclusion1 decks3 decks
31%synergy
Rose Room Treasurer
33%inclusion1 decks3 decks
32%synergy
Archivist of Oghma
33%inclusion1 decks3 decks
29%synergy
Zoanthrope
33%inclusion1 decks3 decks
32%synergy
Faerie Mastermind
33%inclusion1 decks3 decks
27%synergy
Esper Sentinel
33%inclusion1 decks3 decks
14%synergy
Displacer Kitten
33%inclusion1 decks3 decks
28%synergy
Instants
Beast Within
100%inclusion2 decks2 decks
65%synergy
Chaos Warp
67%inclusion2 decks3 decks
36%synergy
Rapid Hybridization
67%inclusion2 decks3 decks
57%synergy
Cyclonic Rift
67%inclusion2 decks3 decks
43%synergy
Generous Gift
67%inclusion2 decks3 decks
44%synergy
First Day of Class
67%inclusion2 decks3 decks
66%synergy
Counterspell
67%inclusion2 decks3 decks
25%synergy
Path to Exile
67%inclusion2 decks3 decks
20%synergy
Swords to Plowshares
67%inclusion2 decks3 decks
5%synergy
Mana Drain
67%inclusion2 decks3 decks
52%synergy
Stinging Study
50%inclusion1 decks2 decks
49%synergy
Mystical Teachings
50%inclusion1 decks2 decks
50%synergy
Brainstorm
33%inclusion1 decks3 decks
15%synergy
Fling
33%inclusion1 decks3 decks
31%synergy
Opt
33%inclusion1 decks3 decks
24%synergy
Cloudshift
33%inclusion1 decks3 decks
30%synergy
Ephemerate
33%inclusion1 decks3 decks
27%synergy
Aurelia's Fury
33%inclusion1 decks3 decks
32%synergy
Shelter
33%inclusion1 decks3 decks
32%synergy
Deflecting Swat
33%inclusion1 decks3 decks
17%synergy
Flawless Maneuver
33%inclusion1 decks3 decks
23%synergy
Collateral Damage
33%inclusion1 decks3 decks
33%synergy
Consider
33%inclusion1 decks3 decks
27%synergy
Force of Will
33%inclusion1 decks3 decks
23%synergy
Mystical Tutor
33%inclusion1 decks3 decks
21%synergy
Enlightened Tutor
33%inclusion1 decks3 decks
18%synergy
Cryptic Command
33%inclusion1 decks3 decks
31%synergy
Force of Negation
33%inclusion1 decks3 decks
25%synergy
Sorceries
Deathbellow War Cry
67%inclusion2 decks3 decks
67%synergy
Rite of Replication
67%inclusion2 decks3 decks
64%synergy
Faithless Looting
33%inclusion1 decks3 decks
17%synergy
Preordain
33%inclusion1 decks3 decks
24%synergy
Serum Visions
33%inclusion1 decks3 decks
30%synergy
Blasphemous Act
33%inclusion1 decks3 decks
0%synergy
Blaze
33%inclusion1 decks3 decks
33%synergy
Banefire
33%inclusion1 decks3 decks
32%synergy
Crackle with Power
33%inclusion1 decks3 decks
31%synergy
Farewell
33%inclusion1 decks3 decks
20%synergy
Fireball
33%inclusion1 decks3 decks
33%synergy
Fabricate
33%inclusion1 decks3 decks
28%synergy
Personal Tutor
33%inclusion1 decks3 decks
32%synergy
Utility Artifacts
The Great Henge
100%inclusion2 decks2 decks
91%synergy
Grindstone
67%inclusion2 decks3 decks
66%synergy
Voltaic Key
67%inclusion2 decks3 decks
66%synergy
Altar of Dementia
67%inclusion2 decks3 decks
64%synergy
Amulet of Vigor
67%inclusion2 decks3 decks
66%synergy
Phyrexian Altar
67%inclusion2 decks3 decks
63%synergy
The One Ring
67%inclusion2 decks3 decks
58%synergy
Lightning Greaves
33%inclusion1 decks3 decks
8%synergy
Clock of Omens
33%inclusion1 decks3 decks
32%synergy
Unwinding Clock
33%inclusion1 decks3 decks
31%synergy
Eldrazi Monument
33%inclusion1 decks3 decks
32%synergy
Blasting Station
33%inclusion1 decks3 decks
33%synergy
The Golden Throne
33%inclusion1 decks3 decks
33%synergy
Enchantments
Solemnity
67%inclusion2 decks3 decks
66%synergy
Storm the Vault
67%inclusion2 decks3 decks
64%synergy
Rhystic Study
67%inclusion2 decks3 decks
42%synergy
Rhythm of the Wild
50%inclusion1 decks2 decks
27%synergy
Goblin Bombardment
33%inclusion1 decks3 decks
28%synergy
Impact Tremors
33%inclusion1 decks3 decks
23%synergy
Martyr's Cause
33%inclusion1 decks3 decks
33%synergy
Pandemonium
33%inclusion1 decks3 decks
33%synergy
Mystic Remora
33%inclusion1 decks3 decks
17%synergy
Warleader's Call
33%inclusion1 decks3 decks
26%synergy
Utility Lands
Thespian's Stage
67%inclusion2 decks3 decks
64%synergy
Dark Depths
67%inclusion2 decks3 decks
65%synergy
Reliquary Tower
33%inclusion1 decks3 decks
3%synergy
Arcane Lighthouse
33%inclusion1 decks3 decks
32%synergy
Mana Artifacts
Sol Ring
100%inclusion3 decks3 decks
16%synergy
Talisman of Dominance
100%inclusion2 decks2 decks
67%synergy
Talisman of Hierarchy
100%inclusion2 decks2 decks
74%synergy
Talisman of Resilience
100%inclusion2 decks2 decks
87%synergy
Talisman of Curiosity
100%inclusion2 decks2 decks
87%synergy
Talisman of Indulgence
100%inclusion2 decks2 decks
72%synergy
Talisman of Impulse
100%inclusion2 decks2 decks
90%synergy
Talisman of Unity
100%inclusion2 decks2 decks
92%synergy
Timeless Lotus
100%inclusion2 decks2 decks
90%synergy
Mana Vault
67%inclusion2 decks3 decks
61%synergy
Talisman of Progress
67%inclusion2 decks3 decks
41%synergy
Talisman of Creativity
67%inclusion2 decks3 decks
38%synergy
Talisman of Conviction
67%inclusion2 decks3 decks
42%synergy
Arcane Signet
33%inclusion1 decks3 decks
-39%synergy
Sol Talisman
33%inclusion1 decks3 decks
33%synergy
Lands
Command Tower
100%inclusion3 decks3 decks
26%synergy
Breeding Pool
100%inclusion2 decks2 decks
59%synergy
Godless Shrine
100%inclusion2 decks2 decks
59%synergy
Sacred Foundry
100%inclusion3 decks3 decks
64%synergy
Stomping Ground
100%inclusion2 decks2 decks
59%synergy
Watery Grave
100%inclusion2 decks2 decks
59%synergy
Blood Crypt
100%inclusion2 decks2 decks
63%synergy
Hallowed Fountain
100%inclusion3 decks3 decks
60%synergy
Overgrown Tomb
100%inclusion2 decks2 decks
60%synergy
Steam Vents
100%inclusion3 decks3 decks
62%synergy
Temple Garden
100%inclusion2 decks2 decks
61%synergy
Reflecting Pool
100%inclusion3 decks3 decks
95%synergy
Glacial Fortress
67%inclusion2 decks3 decks
35%synergy
Clifftop Retreat
67%inclusion2 decks3 decks
32%synergy
Sulfur Falls
67%inclusion2 decks3 decks
32%synergy
Sea of Clouds
67%inclusion2 decks3 decks
42%synergy
Spectator Seating
67%inclusion2 decks3 decks
43%synergy
Training Center
67%inclusion2 decks3 decks
41%synergy
Vivid Marsh
50%inclusion1 decks2 decks
49%synergy
Vivid Grove
50%inclusion1 decks2 decks
49%synergy
Drowned Catacomb
50%inclusion1 decks2 decks
21%synergy
Dragonskull Summit
50%inclusion1 decks2 decks
16%synergy
Rootbound Crag
50%inclusion1 decks2 decks
23%synergy
Sunpetal Grove
50%inclusion1 decks2 decks
23%synergy
Isolated Chapel
50%inclusion1 decks2 decks
17%synergy
Hinterland Harbor
50%inclusion1 decks2 decks
18%synergy
Woodland Cemetery
50%inclusion1 decks2 decks
19%synergy
Bayou
50%inclusion1 decks2 decks
37%synergy
Badlands
50%inclusion1 decks2 decks
37%synergy
Scrubland
50%inclusion1 decks2 decks
36%synergy
Savannah
50%inclusion1 decks2 decks
37%synergy
Taiga
50%inclusion1 decks2 decks
37%synergy
Tropical Island
50%inclusion1 decks2 decks
36%synergy
Underground Sea
50%inclusion1 decks2 decks
35%synergy
Bountiful Promenade
50%inclusion1 decks2 decks
27%synergy
Luxury Suite
50%inclusion1 decks2 decks
25%synergy
Morphic Pool
50%inclusion1 decks2 decks
25%synergy
Spire Garden
50%inclusion1 decks2 decks
28%synergy
Rejuvenating Springs
50%inclusion1 decks2 decks
23%synergy
Vault of Champions
50%inclusion1 decks2 decks
26%synergy
Undergrowth Stadium
50%inclusion1 decks2 decks
26%synergy
Exotic Orchard
33%inclusion1 decks3 decks
-3%synergy
Vivid Crag
33%inclusion1 decks3 decks
33%synergy
Vivid Meadow
33%inclusion1 decks3 decks
33%synergy
Vivid Creek
33%inclusion1 decks3 decks
32%synergy
Mystic Monastery
33%inclusion1 decks3 decks
5%synergy
Flooded Strand
33%inclusion1 decks3 decks
22%synergy
Nimbus Maze
33%inclusion1 decks3 decks
29%synergy
Spirebluff Canal
33%inclusion1 decks3 decks
29%synergy
Arid Mesa
33%inclusion1 decks3 decks
23%synergy