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
0.12% of 5866 decks 7 decks
Ghave, Guru of Spores
0.06% of 6440 decks 4 decks
Nethroi, Apex of Death
0.03% of 5825 decks 2 decks
Atraxa, Praetors' Voice
0.01% of 35754 decks 2 decks
Ishai, Ojutai Dragonspeaker // Reyhan, Last of the Abzan
0.13% of 1572 decks 2 decks
Reyhan, Last of the Abzan // Yoshimaru, Ever Faithful
0.11% of 1758 decks 2 decks
The Necrobloom
0.02% of 10238 decks 2 decks
Tazri, Stalwart Survivor
0.05% of 1861 decks 1 decks
Kenrith, the Returned King
0.00% of 21799 decks 1 decks
Anafenza, the Foremost
0.09% of 1096 decks 1 decks
High Synergy Cards
Master Biomancer
67% of 6 decks +63% synergy
Six
50% of 8 decks +43% synergy
Hardened Scales
50% of 24 decks +41% synergy
Devoted Druid
42% of 24 decks +39% synergy
Winding Constrictor
42% of 24 decks +38% synergy
Yavimaya, Cradle of Growth
46% of 24 decks +37% synergy
Birds of Paradise
62% of 24 decks +35% synergy
Bloom Tender
42% of 24 decks +34% synergy
Esper Sentinel
54% of 24 decks +34% synergy
Court of Garenbrig
37% of 19 decks +33% synergy
Top Cards
Swords to Plowshares
67% of 24 decks +4% synergy
Kutzil, Malamet Exemplar
44% of 16 decks +25% synergy
Enlightened Tutor
42% of 24 decks +24% synergy
Rishkar, Peema Renegade
38% of 24 decks +33% synergy
Ozolith, the Shattered Spire
38% of 24 decks +31% synergy
Ashnod's Altar
38% of 24 decks +30% synergy
Eternal Witness
38% of 24 decks +17% synergy
Assassin's Trophy
38% of 24 decks +7% synergy
Luminous Broodmoth
33% of 24 decks +31% synergy
Walking Ballista
33% of 24 decks +31% synergy
Creatures
Warren Soultrader
43% of 7 decks +36% synergy
Grist, Voracious Larva
38% of 8 decks +35% synergy
Yawgmoth, Thran Physician
33% of 24 decks +30% synergy
Carrion Feeder
33% of 24 decks +28% synergy
Champion of Lambholt
33% of 24 decks +26% synergy
Evolution Sage
33% of 24 decks +26% synergy
Good-Fortune Unicorn
29% of 24 decks +27% synergy
Kami of Whispered Hopes
29% of 24 decks +22% synergy
Bristly Bill, Spine Sower
27% of 11 decks +23% synergy
Wall of Roots
25% of 24 decks +24% synergy
Arwen, Weaver of Hope
25% of 24 decks +22% synergy
Managorger Hydra
25% of 24 decks +21% synergy
Blood Artist
25% of 24 decks +13% synergy
Deathrite Shaman
25% of 24 decks +13% synergy
Llanowar Elves
25% of 24 decks +4% synergy
Bartolomé del Presidio
22% of 18 decks +15% synergy
Mikaeus, the Lunarch
21% of 24 decks +18% synergy
Spore Frog
21% of 24 decks +18% synergy
Skyclave Apparition
21% of 24 decks +18% synergy
Lae'zel, Vlaakith's Champion
21% of 24 decks +18% synergy
Incubation Druid
21% of 24 decks +16% synergy
Dauthi Voidwalker
21% of 24 decks +13% synergy
Delighted Halfling
21% of 24 decks +7% synergy
Sakura-Tribe Elder
21% of 24 decks +2% synergy
Young Wolf
17% of 24 decks +16% synergy
Geralf's Messenger
17% of 24 decks +16% synergy
Ghave, Guru of Spores
17% of 24 decks +16% synergy
Endurance
17% of 24 decks +14% synergy
Vorinclex, Monstrous Raider
17% of 24 decks +13% synergy
Conclave Mentor
17% of 24 decks +12% synergy
Plaguecrafter
17% of 24 decks +12% synergy
Corpsejack Menace
17% of 24 decks +12% synergy
Wood Elves
17% of 24 decks +10% synergy
Cankerbloom
17% of 24 decks +10% synergy
Cruel Celebrant
17% of 24 decks +8% synergy
Zulaport Cutthroat
17% of 24 decks +7% synergy
Elves of Deep Shadow
17% of 24 decks +6% synergy
Avacyn's Pilgrim
17% of 24 decks +2% synergy
Cryptic Trilobite
12% of 24 decks +12% synergy
Crystalline Crawler
12% of 24 decks +12% synergy
Polukranos, Unchained
12% of 24 decks +12% synergy
Utopia Mycon
12% of 24 decks +12% synergy
Pir, Imaginative Rascal
12% of 24 decks +12% synergy
Anafenza, Kin-Tree Spirit
12% of 24 decks +11% synergy
Reyhan, Last of the Abzan
12% of 24 decks +11% synergy
Hermit Druid
12% of 24 decks +11% synergy
Metallic Mimic
12% of 24 decks +11% synergy
Golgari Grave-Troll
12% of 24 decks +11% synergy
Tymna the Weaver
12% of 24 decks +11% synergy
Arwen, Mortal Queen
12% of 24 decks +11% synergy
Instants
Path to Exile
33% of 24 decks -12% synergy
Vampiric Tutor
29% of 24 decks +11% synergy
Chord of Calling
25% of 24 decks +19% synergy
Dark Ritual
21% of 24 decks -2% synergy
Abzan Charm
17% of 24 decks +12% synergy
Abrupt Decay
17% of 24 decks +6% synergy
Worldly Tutor
17% of 24 decks +3% synergy
Teferi's Protection
17% of 24 decks -3% synergy
Beast Within
17% of 24 decks -22% synergy
Entomb
12% of 24 decks +5% synergy
Inspiring Call
12% of 24 decks +5% synergy
Malakir Rebirth
12% of 24 decks +4% synergy
Crop Rotation
12% of 24 decks +3% synergy
Anguished Unmaking
12% of 24 decks -12% synergy
Generous Gift
12% of 24 decks -13% synergy
Heroic Intervention
12% of 24 decks -17% synergy
Sorceries
Demonic Tutor
46% of 24 decks +24% synergy
Eerie Ultimatum
33% of 24 decks +21% synergy
Nature's Lore
33% of 24 decks +1% synergy
Reanimate
25% of 24 decks +9% synergy
Three Visits
25% of 24 decks +0% synergy
Life from the Loam
21% of 24 decks +17% synergy
Toxic Deluge
21% of 24 decks +3% synergy
Damning Verdict
17% of 24 decks +15% synergy
Agadeem's Awakening
17% of 24 decks +13% synergy
Eldritch Evolution
17% of 24 decks +12% synergy
Culling Ritual
17% of 24 decks +6% synergy
Farseek
17% of 24 decks -18% synergy
Green Sun's Zenith
12% of 24 decks +6% synergy
Damnation
12% of 24 decks +5% synergy
Bala Ged Recovery
12% of 24 decks +4% synergy
Explore
12% of 24 decks +3% synergy
Utility Artifacts
The Ozolith
33% of 24 decks +30% synergy
The Great Henge
33% of 24 decks +23% synergy
Altar of Dementia
29% of 24 decks +26% synergy
Skullclamp
29% of 24 decks +17% synergy
Phyrexian Altar
21% of 24 decks +17% synergy
Lightning Greaves
21% of 24 decks -5% synergy
Matzalantli, the Great Door
17% of 18 decks +15% synergy
Heartstone
12% of 24 decks +12% synergy
Enchantments
Ripples of Undeath
50% of 6 decks +44% synergy
Brokers Ascendancy
50% of 6 decks +43% synergy
Insidious Roots
31% of 13 decks +22% synergy
Tribute to the World Tree
29% of 24 decks +21% synergy
Doubling Season
29% of 24 decks +20% synergy
Virtue of Loyalty
29% of 21 decks +26% synergy
Abzan Ascendancy
25% of 24 decks +23% synergy
Felidar Retreat
25% of 24 decks +18% synergy
The Meathook Massacre
21% of 24 decks +16% synergy
Aura Shards
21% of 24 decks +12% synergy
Animate Dead
21% of 24 decks +12% synergy
Sylvan Library
21% of 24 decks +9% synergy
Black Market Connections
17% of 24 decks +6% synergy
Earthcraft
12% of 24 decks +12% synergy
Song of Freyalise
12% of 24 decks +11% synergy
Resourceful Defense
12% of 24 decks +11% synergy
Master Chef
12% of 24 decks +11% synergy
Survival of the Fittest
12% of 24 decks +11% synergy
Tocasia's Welcome
12% of 24 decks +9% synergy
Branching Evolution
12% of 24 decks +7% synergy
Kenrith's Transformation
12% of 24 decks +6% synergy
Anointed Procession
12% of 24 decks +4% synergy
Smothering Tithe
12% of 24 decks -12% synergy
Planeswalkers
Tyvar, Jubilant Brawler
25% of 24 decks +20% synergy
Nissa, Voice of Zendikar
12% of 24 decks +11% synergy
Utility Lands
Boseiju, Who Endures
46% of 24 decks +26% synergy
Shifting Woodland
43% of 7 decks +33% synergy
Urborg, Tomb of Yawgmoth
38% of 24 decks +28% synergy
Takenuma, Abandoned Mire
33% of 24 decks +23% synergy
Phyrexian Tower
25% of 24 decks +16% synergy
Ancient Tomb
25% of 24 decks +15% synergy
Field of the Dead
21% of 24 decks +17% synergy
Karn's Bastion
21% of 24 decks +16% synergy
Gaea's Cradle
21% of 24 decks +15% synergy
Urza's Saga
21% of 24 decks +14% synergy
Eiganjo, Seat of the Empire
21% of 24 decks +12% synergy
Gavony Township
21% of 24 decks +11% synergy
Dryad Arbor
12% of 24 decks +8% synergy
Shizo, Death's Storehouse
12% of 24 decks +8% synergy
Oran-Rief, the Vastwood
12% of 24 decks +8% synergy
Minas Tirith
12% of 24 decks +3% synergy
Mana Artifacts
Sol Ring
83% of 24 decks -1% synergy
Arcane Signet
67% of 24 decks -5% synergy
Mana Crypt
17% of 24 decks +8% synergy
Fellwar Stone
17% of 24 decks -4% synergy
Jeweled Lotus
12% of 24 decks +7% synergy
Chromatic Lantern
12% of 24 decks +3% synergy
Lands
Command Tower
92% of 24 decks +18% synergy
Temple Garden
88% of 24 decks +47% synergy
Overgrown Tomb
88% of 24 decks +45% synergy
Hallowed Fountain
83% of 6 decks +43% synergy
Watery Grave
83% of 6 decks +43% synergy
Breeding Pool
83% of 6 decks +42% synergy
Godless Shrine
79% of 24 decks +39% synergy
Verdant Catacombs
75% of 24 decks +64% synergy
Indatha Triome
75% of 24 decks +44% synergy
Windswept Heath
71% of 24 decks +60% synergy
Marsh Flats
71% of 24 decks +60% synergy
Raffine's Tower
67% of 6 decks +39% synergy
Zagoth Triome
67% of 6 decks +36% synergy
Spara's Headquarters
67% of 6 decks +35% synergy
Vault of Champions
54% of 24 decks +28% synergy
Undergrowth Stadium
54% of 24 decks +28% synergy
Exotic Orchard
54% of 24 decks +19% synergy
Bountiful Promenade
50% of 24 decks +26% synergy
Lush Portico
46% of 13 decks +34% synergy
Misty Rainforest
46% of 24 decks +34% synergy
City of Brass
42% of 24 decks +34% synergy
Flooded Strand
42% of 24 decks +31% synergy
Wooded Foothills
33% of 24 decks +23% synergy
Polluted Delta
33% of 24 decks +22% synergy
Savannah
33% of 24 decks +20% synergy
Bayou
33% of 24 decks +20% synergy
Scrubland
33% of 24 decks +20% synergy
Underground Mortuary
31% of 13 decks +14% synergy
Mana Confluence
29% of 24 decks +22% synergy
Bloodstained Mire
29% of 24 decks +19% synergy
Brushland
25% of 24 decks +9% synergy
Woodland Cemetery
25% of 24 decks -3% synergy
Caves of Koilos
25% of 24 decks -3% synergy
Shadowy Backstreet
23% of 13 decks +10% synergy
Horizon Canopy
21% of 24 decks +16% synergy
Arid Mesa
21% of 24 decks +10% synergy
Overgrown Farmland
21% of 24 decks +5% synergy
Sunpetal Grove
21% of 24 decks -3% synergy
Llanowar Wastes
21% of 24 decks -5% synergy
Prismatic Vista
17% of 24 decks +11% synergy
Nurturing Peatland
17% of 24 decks +11% synergy
Deathcap Glade
17% of 24 decks +3% synergy
Isolated Chapel
17% of 24 decks -11% synergy
Canopy Vista
17% of 24 decks -19% synergy
Wooded Bastion
12% of 24 decks +8% synergy
Gemstone Caverns
12% of 24 decks +8% synergy
Reflecting Pool
12% of 24 decks +7% synergy
Murmuring Bosk
12% of 24 decks +5% synergy
Fabled Passage
12% of 24 decks +3% synergy
Twilight Mire
12% of 24 decks +3% synergy