River Kelpie + Mikaeus, the Unhallowed + Spawning Pit

River Kelpie
Mikaeus, the Unhallowed
Spawning Pit

Requires
River Kelpie must be on the battlefield. Mikaeus, the Unhallowed must be on the battlefield. Spawning Pit must be on the battlefield.
Steps
  1. Activate Spawning Pit by sacrificing River Kelpie.
  2. River Kelpie's persist and undying abilities trigger.
  3. Resolve the persist trigger, returning River Kelpie from your graveyard to the battlefield with a -1/-1 counter on it.
  4. River Kelpie enters the battlefield, causing you to draw.
  5. The undying trigger fails to resolve because River Kelpie is not in your graveyard.
  6. Resolve the Spawning Pit trigger, putting a charge counter on it.
  7. Activate Spawning Pit by sacrificing River Kelpie.
  8. River Kelpie's undying and persist abilities trigger.
  9. Resolve the undying trigger, returning River Kelpie from your graveyard to the battlefield with a +1/+1 counter on it.
  10. River Kelpie enters the battlefield, causing you to draw a card.
  11. The persist trigger fails to resolve because River Kelpie is not in your graveyard.
  12. Resolve the Spawning Pit trigger, putting a charge counter on it.
  13. Repeat.
Results
Infinite card draw. Near-infinite death triggers. Near-infinite ETB. Near-infinite LTB. Near-infinite sacrifice triggers.

Marchesa, the Black Rose
0.90% of 9321 decks 84 decks
Zur the Enchanter
0.03% of 11095 decks 3 decks
Kenrith, the Returned King
0.01% of 21513 decks 2 decks
Ertai, the Corrupted
0.14% of 732 decks 1 decks
Satoru, the Infiltrator
0.08% of 1256 decks 1 decks
Garth One-Eye
0.02% of 4123 decks 1 decks
Uchbenbak, the Great Mistake
0.58% of 171 decks 1 decks
High Synergy Cards
Flayer of the Hatebound
87% of 87 decks +87% synergy
Unspeakable Symbol
85% of 93 decks +84% synergy
Luminous Broodmoth
86% of 7 decks +84% synergy
Carrion Feeder
85% of 93 decks +80% synergy
Goblin Bombardment
84% of 87 decks +77% synergy
Viscera Seer
84% of 93 decks +74% synergy
Uncivil Unrest
75% of 65 decks +74% synergy
Ashnod's Altar
73% of 93 decks +66% synergy
Iron Apprentice
64% of 89 decks +64% synergy
Grim Haruspex
68% of 93 decks +64% synergy
Top Cards
Baleful Strix
67% of 93 decks +53% synergy
Yahenni, Undying Partisan
65% of 92 decks +62% synergy
Blasphemous Act
63% of 87 decks +30% synergy
Glen Elendra Archmage
60% of 93 decks +58% synergy
Solemn Simulacrum
60% of 93 decks +46% synergy
Thran Vigil
60% of 80 decks +59% synergy
Warren Soultrader
60% of 20 decks +53% synergy
Solemnity
57% of 7 decks +56% synergy
Gev, Scaled Scorch
56% of 9 decks +54% synergy
Danny Pink
55% of 47 decks +54% synergy
Creatures
Scorn-Blade Berserker
55% of 66 decks +54% synergy
Satoru, the Infiltrator
54% of 28 decks +50% synergy
Elas il-Kor, Sadistic Pilgrim
50% of 6 decks +38% synergy
Mulldrifter
49% of 93 decks +44% synergy
Puppeteer Clique
46% of 93 decks +45% synergy
Drana, Liberator of Malakir
45% of 92 decks +42% synergy
Herald of Secret Streams
45% of 92 decks +42% synergy
Cruel Celebrant
43% of 7 decks +34% synergy
Sage of Fables
42% of 93 decks +41% synergy
Spark Double
40% of 92 decks +33% synergy
Pollywog Prodigy
40% of 10 decks +27% synergy
Juri, Master of the Revue
39% of 84 decks +36% synergy
Accursed Marauder
38% of 16 decks +28% synergy
Zealous Conscripts
37% of 87 decks +35% synergy
Marionette Apprentice
35% of 20 decks +27% synergy
Yawgmoth, Thran Physician
35% of 92 decks +31% synergy
Mahadi, Emporium Master
34% of 82 decks +28% synergy
Thundering Raiju
32% of 84 decks +31% synergy
Gray Merchant of Asphodel
31% of 93 decks +22% synergy
Braids, Arisen Nightmare
30% of 86 decks +22% synergy
Greedy Freebooter
30% of 40 decks +28% synergy
Midnight Reaper
28% of 92 decks +24% synergy
Disciple of Bolas
28% of 93 decks +25% synergy
Chasm Skulker
28% of 93 decks +24% synergy
Dockside Extortionist
28% of 86 decks +15% synergy
Bloodflow Connoisseur
27% of 93 decks +26% synergy
Blood Artist
27% of 93 decks +15% synergy
Imperial Recruiter
26% of 87 decks +20% synergy
Bloodtracker
26% of 92 decks +25% synergy
Gisa, Glorious Resurrector
26% of 89 decks +24% synergy
Voldaren Thrillseeker
26% of 66 decks +25% synergy
Fain, the Broker
25% of 89 decks +23% synergy
Woe Strider
24% of 91 decks +22% synergy
Murderous Redcap
24% of 87 decks +23% synergy
Legate Lanius, Caesar's Ace
23% of 26 decks +22% synergy
Pitiless Plunderer
23% of 92 decks +15% synergy
Kalain, Reclusive Painter
21% of 84 decks +19% synergy
Molten Primordial
21% of 87 decks +20% synergy
Junji, the Midnight Sky
19% of 89 decks +16% synergy
Dauthi Voidwalker
19% of 89 decks +11% synergy
Thought Sponge
17% of 92 decks +17% synergy
Metallic Mimic
17% of 92 decks +16% synergy
Rakdos, the Muscle
17% of 24 decks +14% synergy
Siren Stormtamer
16% of 92 decks +13% synergy
Hostage Taker
16% of 92 decks +12% synergy
Cytoplast Manipulator
16% of 93 decks +16% synergy
Kethek, Crucible Goliath
16% of 69 decks +15% synergy
Body Launderer
16% of 89 decks +15% synergy
Atsushi, the Blazing Sky
15% of 84 decks +13% synergy
Captivating Crew
15% of 86 decks +14% synergy
Instants
Chaos Warp
51% of 87 decks +18% synergy
Enlightened Tutor
43% of 7 decks +25% synergy
Swords to Plowshares
43% of 7 decks -20% synergy
Village Rites
32% of 91 decks +22% synergy
Counterspell
28% of 93 decks -15% synergy
Deadly Dispute
25% of 89 decks +14% synergy
Cyclonic Rift
24% of 93 decks -4% synergy
Act of Aggression
21% of 87 decks +20% synergy
Terminate
21% of 87 decks -0% synergy
Fierce Guardianship
19% of 91 decks +1% synergy
Vampiric Tutor
18% of 93 decks -0% synergy
Negate
17% of 93 decks -6% synergy
Lethal Scheme
17% of 89 decks +16% synergy
Plumb the Forbidden
17% of 89 decks +14% synergy
Mana Drain
15% of 93 decks -0% synergy
Arcane Denial
15% of 93 decks -5% synergy
Fell the Profane
15% of 20 decks +3% synergy
Sink into Stupor
15% of 20 decks +2% synergy
Feign Death
15% of 89 decks +12% synergy
First Day of Class
14% of 84 decks +14% synergy
Domineering Will
14% of 93 decks +14% synergy
Swan Song
14% of 93 decks -3% synergy
An Offer You Can't Refuse
13% of 89 decks -7% synergy
Malakir Rebirth
13% of 90 decks +5% synergy
Undying Malice
12% of 89 decks +10% synergy
Reality Shift
12% of 93 decks +3% synergy
Rakdos Charm
10% of 87 decks -4% synergy
Deadly Rollick
10% of 91 decks -1% synergy
Deflecting Swat
9% of 85 decks -7% synergy
Bedevil
9% of 86 decks -5% synergy
Nasty End
9% of 56 decks +6% synergy
Dark Ritual
9% of 93 decks -14% synergy
Slip Out the Back
8% of 89 decks +5% synergy
Corrupted Conviction
8% of 66 decks +2% synergy
Mystical Tutor
6% of 93 decks -9% synergy
Flame of Anor
6% of 51 decks +1% synergy
Word of Seizing
6% of 87 decks +6% synergy
Infernal Grasp
6% of 89 decks -2% synergy
Teferi's Time Twist
5% of 92 decks +4% synergy
Force of Negation
5% of 92 decks -4% synergy
Altar's Reap
5% of 93 decks +4% synergy
Go for the Throat
5% of 93 decks -2% synergy
Sorceries
Mark of Mutiny
39% of 87 decks +39% synergy
Feed the Swarm
29% of 90 decks +11% synergy
Vandalblast
28% of 87 decks +11% synergy
Toxic Deluge
27% of 93 decks +10% synergy
Mob Rule
25% of 87 decks +24% synergy
Damnation
23% of 93 decks +14% synergy
Demonic Tutor
23% of 93 decks +0% synergy
Seize the Spotlight
21% of 84 decks +20% synergy
Mass Mutiny
20% of 87 decks +19% synergy
Insurrection
20% of 87 decks +18% synergy
Diabolic Intent
18% of 93 decks +9% synergy
Kari Zev's Expertise
16% of 86 decks +16% synergy
Living Death
15% of 93 decks +10% synergy
Victimize
15% of 93 decks +3% synergy
Wave Goodbye
15% of 40 decks +12% synergy
Act of Treason
11% of 87 decks +11% synergy
Grim Tutor
11% of 93 decks +6% synergy
Last One Standing
10% of 86 decks +9% synergy
Chain Reaction
10% of 87 decks +5% synergy
Agadeem's Awakening
10% of 90 decks +6% synergy
Furnace Reins
9% of 66 decks +8% synergy
Read the Bones
9% of 93 decks +1% synergy
Night's Whisper
9% of 93 decks -0% synergy
Press into Service
8% of 86 decks +8% synergy
Reanimate
8% of 93 decks -8% synergy
Harness by Force
7% of 87 decks +7% synergy
Traitorous Blood
7% of 87 decks +7% synergy
Slave of Bolas
7% of 87 decks +6% synergy
Diabolic Tutor
6% of 93 decks +0% synergy
Sign in Blood
6% of 93 decks -3% synergy
Jeska's Will
6% of 84 decks -12% synergy
Painful Truths
5% of 92 decks +3% synergy
Utility Artifacts
Phyrexian Altar
46% of 93 decks +42% synergy
Skullclamp
46% of 93 decks +34% synergy
Lightning Greaves
44% of 93 decks +19% synergy
Altar of Dementia
40% of 93 decks +37% synergy
The Ozolith
35% of 91 decks +32% synergy
Andúril, Narsil Reforged
31% of 48 decks +30% synergy
Swiftfoot Boots
27% of 93 decks -1% synergy
Bolas's Citadel
11% of 92 decks +2% synergy
Desecrated Tomb
10% of 92 decks +9% synergy
Agatha's Soul Cauldron
9% of 53 decks +8% synergy
The Golden Throne
9% of 82 decks +8% synergy
Wayfarer's Bauble
6% of 93 decks -4% synergy
Power Conduit
5% of 93 decks +5% synergy
Blasting Station
5% of 93 decks +5% synergy
Enchantments
Inner Sanctum
43% of 7 decks +43% synergy
Celestial Convergence
43% of 7 decks +43% synergy
Delaying Shield
43% of 7 decks +43% synergy
Phyrexian Unlife
43% of 7 decks +42% synergy
Sneak Attack
38% of 87 decks +35% synergy
Rhystic Study
30% of 93 decks +2% synergy
Feast on the Fallen
22% of 93 decks +21% synergy
Grave Betrayal
19% of 93 decks +18% synergy
Attrition
17% of 93 decks +16% synergy
Dictate of Erebos
17% of 93 decks +13% synergy
Grave Pact
17% of 93 decks +13% synergy
Phyrexian Arena
17% of 93 decks +2% synergy
Black Market
15% of 93 decks +10% synergy
Warstorm Surge
15% of 87 decks +10% synergy
Necropotence
14% of 93 decks +9% synergy
Shifting Shadow
10% of 86 decks +10% synergy
Black Market Connections
10% of 87 decks -1% synergy
Vampiric Rites
10% of 92 decks +7% synergy
Phyrexian Reclamation
10% of 93 decks +6% synergy
All Will Be One
9% of 67 decks +6% synergy
Mystic Remora
9% of 93 decks -9% synergy
Rising of the Day
8% of 52 decks +2% synergy
The Meathook Massacre
7% of 89 decks +2% synergy
Planeswalkers
Geyadrone Dihada
14% of 84 decks +12% synergy
Utility Lands
High Market
44% of 93 decks +41% synergy
Forge of Heroes
40% of 92 decks +39% synergy
Phyrexian Tower
38% of 93 decks +29% synergy
Spymaster's Vault
35% of 20 decks +31% synergy
Reliquary Tower
33% of 93 decks +4% synergy
Bojuka Bog
26% of 93 decks -5% synergy
Arena of Glory
21% of 14 decks +12% synergy
Urborg, Tomb of Yawgmoth
20% of 93 decks +11% synergy
Drannith Ruins
17% of 59 decks +16% synergy
Tyrite Sanctum
16% of 89 decks +14% synergy
Nesting Grounds
15% of 91 decks +14% synergy
The Black Gate
15% of 54 decks +11% synergy
Ancient Tomb
14% of 93 decks +3% synergy
Otawara, Soaring City
9% of 89 decks -8% synergy
Karn's Bastion
8% of 92 decks +3% synergy
Rogue's Passage
6% of 93 decks -13% synergy
Takenuma, Abandoned Mire
6% of 89 decks -5% synergy
Wasteland
5% of 93 decks +4% synergy
Mana Artifacts
Sol Ring
88% of 93 decks +4% synergy
Arcane Signet
85% of 92 decks +13% synergy
Talisman of Dominance
58% of 93 decks +27% synergy
Talisman of Creativity
55% of 86 decks +26% synergy
Talisman of Indulgence
54% of 87 decks +28% synergy
Rakdos Signet
52% of 87 decks +22% synergy
Dimir Signet
46% of 93 decks +16% synergy
Izzet Signet
36% of 87 decks +7% synergy
Fellwar Stone
30% of 93 decks +9% synergy
Chromatic Lantern
14% of 93 decks +4% synergy
Commander's Sphere
13% of 93 decks -3% synergy
Mana Crypt
11% of 93 decks +2% synergy
Thought Vessel
8% of 92 decks -9% synergy
Mind Stone
8% of 93 decks -10% synergy
Mana Vault
5% of 93 decks -1% synergy
Lands
Command Tower
89% of 93 decks +15% synergy
Crumbling Necropolis
60% of 87 decks +29% synergy
Steam Vents
57% of 87 decks +18% synergy
Watery Grave
57% of 93 decks +16% synergy
Blood Crypt
55% of 87 decks +16% synergy
Dragonskull Summit
53% of 87 decks +22% synergy
Exotic Orchard
51% of 93 decks +15% synergy
Shivan Reef
49% of 87 decks +23% synergy
Xander's Lounge
48% of 84 decks +20% synergy
Underground River
44% of 93 decks +25% synergy
Godless Shrine
43% of 7 decks +2% synergy
Bloodstained Mire
42% of 93 decks +31% synergy
Drowned Catacomb
42% of 93 decks +17% synergy
Sulfurous Springs
41% of 87 decks +21% synergy
Sulfur Falls
41% of 87 decks +11% synergy
Polluted Delta
37% of 93 decks +25% synergy
Opal Palace
35% of 93 decks +33% synergy
Smoldering Marsh
35% of 86 decks +2% synergy
Sunken Hollow
34% of 92 decks -1% synergy
Luxury Suite
31% of 86 decks +5% synergy
Scalding Tarn
31% of 93 decks +20% synergy
City of Brass
29% of 93 decks +21% synergy
Training Center
29% of 84 decks +1% synergy
Guildmages' Forum
27% of 92 decks +27% synergy
Morphic Pool
27% of 92 decks +1% synergy
Mana Confluence
23% of 93 decks +15% synergy
Evolving Wilds
22% of 93 decks +1% synergy
Seething Landscape
21% of 14 decks +5% synergy
Shipwreck Marsh
19% of 89 decks +0% synergy
Path of Ancestry
18% of 92 decks -3% synergy
Terramorphic Expanse
17% of 93 decks +2% synergy
Temple of Deceit
17% of 93 decks +1% synergy
Graven Cairns
16% of 87 decks +8% synergy
Stormcarved Coast
15% of 84 decks -2% synergy
Fabled Passage
15% of 92 decks +6% synergy
Rakdos Carnarium
15% of 87 decks +0% synergy
Badlands
14% of 87 decks +0% synergy
Temple of Malice
14% of 87 decks -0% synergy
Haunted Ridge
13% of 84 decks -3% synergy
Choked Estuary
13% of 92 decks -4% synergy
Underground Sea
13% of 93 decks -1% synergy
Temple of Epiphany
13% of 87 decks -6% synergy
Undercity Sewers
12% of 32 decks -1% synergy
Dimir Aqueduct
12% of 93 decks -5% synergy
Izzet Boilerworks
11% of 87 decks -5% synergy
Clearwater Pathway
11% of 90 decks +1% synergy
Myriad Landscape
11% of 93 decks -9% synergy
Blightstep Pathway
11% of 84 decks +1% synergy
Shadowblood Ridge
10% of 87 decks -2% synergy
Volcanic Island
10% of 87 decks -3% synergy