Agatha's Soul Cauldron + Grist, the Hunger Tide + Cathars' Crusade

Agatha's Soul Cauldron
Grist, the Hunger Tide
Cathars' Crusade

Requires
Agatha's Soul Cauldron must be on the battlefield. Grist, the Hunger Tide must be in exile (exiled by Agatha's Soul Cauldron). Cathars' Crusade must be on the battlefield. You control a creature with a +1/+1 counter on it.
Steps
  1. Activate a creature you control using Grist's first loyalty ability by putting a loyalty counter on it, causing you to create a 1/1 Insect creature token and mill a card, and then put a loyalty counter on the creature and repeat the process if the card was an Insect.
  2. When the Insect enters the battlefield, Cathars' Crusade triggers, putting a +1/+1 counter on each creature you control and causing the Insect token to gain Grist's abilities.
  3. Repeat from step 1 using the Insect token instead.
Results
Infinite +1/+1 counters. Infinite creature tokens. Infinite ETB. Infinite self-mill.

Tayam, Luminous Enigma
0.11% of 5261 decks 6 decks
Ghave, Guru of Spores
0.06% of 6333 decks 4 decks
Nethroi, Apex of Death
0.05% of 5615 decks 3 decks
High Synergy Cards
Master Biomancer
67% of 6 decks +66% synergy
Birds of Paradise
70% of 23 decks +57% synergy
Top Cards
Swords to Plowshares
70% of 23 decks +41% synergy
Esper Sentinel
52% of 23 decks +43% synergy
Hardened Scales
48% of 23 decks +44% synergy
Kutzil, Malamet Exemplar
47% of 15 decks +42% synergy
Winding Constrictor
43% of 23 decks +43% synergy
Devoted Druid
39% of 23 decks +38% synergy
Enlightened Tutor
39% of 23 decks +31% synergy
Eternal Witness
39% of 23 decks +29% synergy
Court of Garenbrig
39% of 18 decks +37% synergy
Luminous Broodmoth
35% of 23 decks +34% synergy
Creatures
Warren Soultrader
43% of 7 decks +38% synergy
Grist, Voracious Larva
38% of 8 decks +37% synergy
Six
38% of 8 decks +33% synergy
Yawgmoth, Thran Physician
35% of 23 decks +33% synergy
Rishkar, Peema Renegade
35% of 23 decks +33% synergy
Carrion Feeder
35% of 23 decks +32% synergy
Bloom Tender
35% of 23 decks +31% synergy
Good-Fortune Unicorn
30% of 23 decks +30% synergy
Walking Ballista
30% of 23 decks +28% synergy
Champion of Lambholt
30% of 23 decks +27% synergy
Evolution Sage
30% of 23 decks +27% synergy
Kami of Whispered Hopes
30% of 23 decks +27% synergy
Bartolomé del Presidio
29% of 17 decks +28% synergy
Arwen, Weaver of Hope
26% of 23 decks +25% synergy
Deathrite Shaman
26% of 23 decks +23% synergy
Blood Artist
26% of 23 decks +20% synergy
Delighted Halfling
26% of 23 decks +19% synergy
Wall of Roots
22% of 23 decks +21% synergy
Mikaeus, the Lunarch
22% of 23 decks +21% synergy
Spore Frog
22% of 23 decks +20% synergy
Skyclave Apparition
22% of 23 decks +20% synergy
Lae'zel, Vlaakith's Champion
22% of 23 decks +20% synergy
Managorger Hydra
22% of 23 decks +20% synergy
Incubation Druid
22% of 23 decks +19% synergy
Dauthi Voidwalker
22% of 23 decks +17% synergy
Sakura-Tribe Elder
22% of 23 decks +13% synergy
Llanowar Elves
22% of 23 decks +12% synergy
Ghave, Guru of Spores
17% of 23 decks +17% synergy
Polukranos, Unchained
17% of 23 decks +17% synergy
Geralf's Messenger
17% of 23 decks +17% synergy
Hermit Druid
17% of 23 decks +17% synergy
Golgari Grave-Troll
17% of 23 decks +17% synergy
Conclave Mentor
17% of 23 decks +16% synergy
Endurance
17% of 23 decks +16% synergy
Corpsejack Menace
17% of 23 decks +16% synergy
Cruel Celebrant
17% of 23 decks +15% synergy
Kodama of the West Tree
17% of 23 decks +15% synergy
Elves of Deep Shadow
17% of 23 decks +15% synergy
Plaguecrafter
17% of 23 decks +15% synergy
Boromir, Warden of the Tower
17% of 23 decks +15% synergy
Ramunap Excavator
17% of 23 decks +14% synergy
Avacyn's Pilgrim
17% of 23 decks +14% synergy
Wood Elves
17% of 23 decks +14% synergy
Cankerbloom
17% of 23 decks +14% synergy
Zulaport Cutthroat
17% of 23 decks +12% synergy
Young Wolf
13% of 23 decks +13% synergy
Cryptic Trilobite
13% of 23 decks +13% synergy
Reyhan, Last of the Abzan
13% of 23 decks +13% synergy
Crystalline Crawler
13% of 23 decks +13% synergy
Utopia Mycon
13% of 23 decks +13% synergy
Instants
Assassin's Trophy
35% of 23 decks +28% synergy
Path to Exile
30% of 23 decks +10% synergy
Chord of Calling
26% of 23 decks +23% synergy
Vampiric Tutor
26% of 23 decks +17% synergy
Abzan Charm
17% of 23 decks +17% synergy
Abrupt Decay
17% of 23 decks +15% synergy
Malakir Rebirth
17% of 23 decks +13% synergy
Teferi's Protection
17% of 23 decks +8% synergy
Heroic Intervention
17% of 23 decks +4% synergy
Veil of Summer
13% of 23 decks +10% synergy
Inspiring Call
13% of 23 decks +10% synergy
Crop Rotation
13% of 23 decks +8% synergy
Anguished Unmaking
13% of 23 decks +7% synergy
Dark Ritual
13% of 23 decks +2% synergy
Beast Within
13% of 23 decks -5% synergy
Sorceries
Demonic Tutor
43% of 23 decks +32% synergy
Eerie Ultimatum
35% of 23 decks +33% synergy
Nature's Lore
30% of 23 decks +15% synergy
Life from the Loam
26% of 23 decks +24% synergy
Toxic Deluge
26% of 23 decks +17% synergy
Three Visits
26% of 23 decks +14% synergy
Agadeem's Awakening
22% of 23 decks +20% synergy
Reanimate
22% of 23 decks +14% synergy
Eldritch Evolution
17% of 23 decks +15% synergy
Damnation
17% of 23 decks +13% synergy
Bala Ged Recovery
17% of 23 decks +13% synergy
Damning Verdict
13% of 23 decks +12% synergy
Culling Ritual
13% of 23 decks +11% synergy
Green Sun's Zenith
13% of 23 decks +10% synergy
Explore
13% of 23 decks +9% synergy
Farseek
13% of 23 decks -3% synergy
Utility Artifacts
Ashnod's Altar
35% of 23 decks +27% synergy
Ozolith, the Shattered Spire
30% of 23 decks +27% synergy
The Ozolith
30% of 23 decks +27% synergy
The Great Henge
30% of 23 decks +26% synergy
Skullclamp
30% of 23 decks +18% synergy
Altar of Dementia
26% of 23 decks +23% synergy
Lightning Greaves
26% of 23 decks +1% synergy
Phyrexian Altar
17% of 23 decks +13% synergy
Enchantments
Ripples of Undeath
60% of 5 decks +56% synergy
Brokers Ascendancy
50% of 6 decks +49% synergy
Insidious Roots
33% of 12 decks +31% synergy
Doubling Season
30% of 23 decks +26% synergy
Tribute to the World Tree
30% of 23 decks +26% synergy
Virtue of Loyalty
26% of 23 decks +25% synergy
Aura Shards
26% of 23 decks +24% synergy
The Meathook Massacre
26% of 23 decks +23% synergy
Felidar Retreat
26% of 23 decks +23% synergy
Abzan Ascendancy
22% of 23 decks +22% synergy
Animate Dead
22% of 23 decks +17% synergy
Sylvan Library
22% of 23 decks +16% synergy
Black Market Connections
17% of 23 decks +12% synergy
Earthcraft
13% of 23 decks +13% synergy
Resourceful Defense
13% of 23 decks +12% synergy
Branching Evolution
13% of 23 decks +11% synergy
Anointed Procession
13% of 23 decks +9% synergy
Smothering Tithe
13% of 23 decks +1% synergy
Planeswalkers
Tyvar, Jubilant Brawler
26% of 23 decks +25% synergy
Wrenn and Realmbreaker
13% of 23 decks +12% synergy
Utility Lands
Boseiju, Who Endures
39% of 23 decks +30% synergy
Yavimaya, Cradle of Growth
39% of 23 decks +30% synergy
Urborg, Tomb of Yawgmoth
35% of 23 decks +25% synergy
Takenuma, Abandoned Mire
26% of 23 decks +20% synergy
Field of the Dead
22% of 23 decks +18% synergy
Phyrexian Tower
22% of 23 decks +17% synergy
Ancient Tomb
22% of 23 decks +11% synergy
Gavony Township
17% of 23 decks +15% synergy
Gaea's Cradle
17% of 23 decks +15% synergy
Eiganjo, Seat of the Empire
17% of 23 decks +13% synergy
Karn's Bastion
17% of 23 decks +12% synergy
Urza's Saga
17% of 23 decks +10% synergy
Dryad Arbor
13% of 23 decks +11% synergy
Oran-Rief, the Vastwood
13% of 23 decks +11% synergy
Minas Tirith
13% of 23 decks +9% synergy
Mana Artifacts
Sol Ring
83% of 23 decks -2% synergy
Arcane Signet
70% of 23 decks -2% synergy
Jeweled Lotus
17% of 23 decks +10% synergy
Mana Crypt
17% of 23 decks +6% synergy
Fellwar Stone
17% of 23 decks -4% synergy
Chromatic Lantern
13% of 23 decks +3% synergy
Lands
Command Tower
96% of 23 decks +22% synergy
Temple Garden
91% of 23 decks +82% synergy
Overgrown Tomb
91% of 23 decks +82% synergy
Hallowed Fountain
83% of 6 decks +74% synergy
Breeding Pool
83% of 6 decks +74% synergy
Watery Grave
83% of 6 decks +73% synergy
Godless Shrine
83% of 23 decks +73% synergy
Indatha Triome
74% of 23 decks +71% synergy
Windswept Heath
74% of 23 decks +64% synergy
Verdant Catacombs
74% of 23 decks +62% synergy
Marsh Flats
70% of 23 decks +58% synergy
Zagoth Triome
67% of 6 decks +63% synergy
Raffine's Tower
67% of 6 decks +63% synergy
Spara's Headquarters
67% of 6 decks +63% synergy
Undergrowth Stadium
57% of 23 decks +51% synergy
Vault of Champions
57% of 23 decks +51% synergy
Bountiful Promenade
52% of 23 decks +47% synergy
Exotic Orchard
52% of 23 decks +17% synergy
Lush Portico
50% of 12 decks +47% synergy
City of Brass
39% of 23 decks +31% synergy
Flooded Strand
39% of 23 decks +29% synergy
Misty Rainforest
39% of 23 decks +27% synergy
Savannah
35% of 23 decks +32% synergy
Bayou
35% of 23 decks +32% synergy
Scrubland
35% of 23 decks +32% synergy
Caves of Koilos
30% of 23 decks +24% synergy
Wooded Foothills
30% of 23 decks +20% synergy
Polluted Delta
30% of 23 decks +19% synergy
Brushland
26% of 23 decks +23% synergy
Woodland Cemetery
26% of 23 decks +20% synergy
Mana Confluence
26% of 23 decks +19% synergy
Bloodstained Mire
26% of 23 decks +16% synergy
Shadowy Backstreet
25% of 12 decks +22% synergy
Underground Mortuary
25% of 12 decks +21% synergy
Horizon Canopy
22% of 23 decks +21% synergy
Sunpetal Grove
22% of 23 decks +17% synergy
Llanowar Wastes
22% of 23 decks +16% synergy
Isolated Chapel
22% of 23 decks +16% synergy
Canopy Vista
22% of 23 decks +14% synergy
Nurturing Peatland
17% of 23 decks +16% synergy
Overgrown Farmland
17% of 23 decks +14% synergy
Prismatic Vista
17% of 23 decks +12% synergy
Murmuring Bosk
13% of 23 decks +12% synergy
Wooded Bastion
13% of 23 decks +12% synergy
Twilight Mire
13% of 23 decks +11% synergy
Fetid Heath
13% of 23 decks +11% synergy
Sandsteppe Citadel
13% of 23 decks +10% synergy
Deathcap Glade
13% of 23 decks +10% synergy
Shattered Sanctum
13% of 23 decks +10% synergy
Orzhov Basilica
13% of 23 decks +9% synergy