Sporoloth Ancient + Tainted Observer + Ashnod's Altar + Tekuthal, Inquiry Dominus

Sporoloth Ancient
Tainted Observer
Ashnod's Altar
Tekuthal, Inquiry Dominus

Requires
Sporoloth Ancient must be on the battlefield. Tainted Observer must be on the battlefield. Ashnod's Altar must be on the battlefield. Tekuthal, Inquiry Dominus must be on the battlefield. You control a creature with at least three spore counters on it.
Steps
  1. Activate a creature you control by removing two spore counters from it, creating a 1/1 Saproling creature token.
  2. The Saproling enters the battlefield, triggering Tainted Observer.
  3. Holding priority, activate Ashnod's Altar by sacrificing the Saproling, adding cc.
  4. Resolve the Tainted Observer trigger, causing you to pay 2 to put two spore counters on any creature you control.
  5. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite proliferate. Infinite sacrifice triggers.

Top Commanders (2)
Xavier Sal, Infested Captain
0.48% of 2497 decks 12 decks
Atraxa, Praetors' Voice
0.03% of 32189 decks 9 decks
High Synergy Cards (10)
Mycologist
100% of 9 decks +100% synergy
Deathspore Thallid
100% of 21 decks +100% synergy
Utopia Mycon
100% of 21 decks +100% synergy
Slimefoot, the Stowaway
100% of 21 decks +100% synergy
Vitaspore Thallid
95% of 21 decks +95% synergy
Sporesower Thallid
95% of 21 decks +95% synergy
Psychotrope Thallid
95% of 21 decks +95% synergy
Mycoloth
95% of 21 decks +94% synergy
Thallid
90% of 21 decks +90% synergy
Spore Flower
81% of 21 decks +81% synergy
Top Cards (10)
Thallid Shell-Dweller
81% of 21 decks +81% synergy
Pallid Mycoderm
78% of 9 decks +78% synergy
Thelon of Havenwood
76% of 21 decks +76% synergy
Savage Thallid
76% of 21 decks +76% synergy
Thallid Germinator
76% of 21 decks +76% synergy
Nemata, Primeval Warden
76% of 21 decks +75% synergy
Winding Constrictor
76% of 21 decks +75% synergy
Evolution Sage
71% of 21 decks +68% synergy
Elvish Farmer
67% of 21 decks +67% synergy
Ghave, Guru of Spores
67% of 9 decks +67% synergy
Creatures (38)
Ezuri, Stalker of Spheres
67% of 21 decks +66% synergy
Cankerbloom
63% of 19 decks +59% synergy
Tendershoot Dryad
62% of 21 decks +61% synergy
Sporecrown Thallid
57% of 21 decks +57% synergy
Mondrak, Glory Dominus
56% of 9 decks +51% synergy
Roaming Throne
50% of 10 decks +33% synergy
Thallid Devourer
48% of 21 decks +48% synergy
Thrummingbird
48% of 21 decks +46% synergy
Lae'zel, Vlaakith's Champion
44% of 9 decks +43% synergy
Vorinclex, Monstrous Raider
43% of 21 decks +41% synergy
Mirkwood Bats
41% of 17 decks +34% synergy
The Mycotyrant
40% of 15 decks +39% synergy
Danny Pink
40% of 15 decks +39% synergy
Thorn Thallid
38% of 21 decks +38% synergy
Undercellar Myconid
38% of 21 decks +38% synergy
Pir, Imaginative Rascal
38% of 21 decks +38% synergy
Yawgmoth, Thran Physician
38% of 21 decks +36% synergy
Pitiless Plunderer
38% of 21 decks +34% synergy
Nemata, Grove Guardian
33% of 21 decks +33% synergy
Plaguemaw Beast
33% of 21 decks +33% synergy
Xavier Sal, Infested Captain
33% of 12 decks +33% synergy
Grateful Apparition
33% of 9 decks +32% synergy
Norn's Choirmaster
33% of 9 decks +32% synergy
Blood Artist
33% of 21 decks +27% synergy
Zulaport Cutthroat
29% of 21 decks +23% synergy
Scheming Aspirant
24% of 21 decks +23% synergy
Sporemound
24% of 21 decks +23% synergy
Birds of Paradise
24% of 21 decks +12% synergy
Thallid Soothsayer
19% of 21 decks +19% synergy
Mindbender Spores
14% of 21 decks +14% synergy
Myconid Spore Tender
14% of 21 decks +14% synergy
Verdeloth the Ancient
14% of 21 decks +14% synergy
Vorel of the Hull Clade
14% of 21 decks +14% synergy
Mazirek, Kraul Death Priest
14% of 21 decks +13% synergy
Deepglow Skate
14% of 21 decks +13% synergy
Adrix and Nev, Twincasters
14% of 21 decks +13% synergy
Kiora's Follower
14% of 21 decks +13% synergy
Flux Channeler
14% of 21 decks +13% synergy
Instants (19)
Ripples of Potential
60% of 10 decks +58% synergy
Aura Mutation
56% of 9 decks +55% synergy
Counterspell
38% of 21 decks +17% synergy
Sprout Swarm
33% of 21 decks +33% synergy
Teferi's Protection
33% of 9 decks +24% synergy
Beast Within
33% of 21 decks +14% synergy
Village Rites
29% of 21 decks +23% synergy
Assassin's Trophy
29% of 21 decks +22% synergy
Fungal Rebirth
24% of 21 decks +23% synergy
Fuel for the Cause
24% of 21 decks +23% synergy
Experimental Augury
24% of 21 decks +22% synergy
Growth Spiral
24% of 21 decks +19% synergy
Heroic Intervention
24% of 21 decks +10% synergy
Serum Snare
21% of 19 decks +20% synergy
Steady Progress
19% of 21 decks +19% synergy
Reject Imperfection
16% of 19 decks +15% synergy
Putrefy
14% of 21 decks +11% synergy
Deadly Dispute
14% of 21 decks +9% synergy
Cyclonic Rift
14% of 21 decks -0% synergy
Sorceries (16)
Farseek
62% of 21 decks +46% synergy
Tezzeret's Gambit
48% of 21 decks +46% synergy
Unnatural Restoration
48% of 21 decks +45% synergy
Cultivate
48% of 21 decks +25% synergy
Saproling Symbiosis
33% of 21 decks +33% synergy
Drown in Ichor
32% of 19 decks +30% synergy
Nature's Lore
29% of 21 decks +14% synergy
Kodama's Reach
29% of 21 decks +13% synergy
Rampant Growth
29% of 21 decks +12% synergy
Three Visits
24% of 21 decks +12% synergy
Contentious Plan
19% of 21 decks +18% synergy
Thirsting Roots
16% of 19 decks +14% synergy
Aether Mutation
14% of 21 decks +14% synergy
Carnivorous Canopy
14% of 21 decks +14% synergy
Bala Ged Recovery
14% of 21 decks +10% synergy
Toxic Deluge
14% of 21 decks +6% synergy
Utility Artifacts (11)
Skullclamp
67% of 21 decks +54% synergy
The Ozolith
33% of 21 decks +30% synergy
Phyrexian Altar
33% of 21 decks +29% synergy
Contagion Engine
29% of 21 decks +27% synergy
Contagion Clasp
29% of 21 decks +27% synergy
Swiftfoot Boots
29% of 21 decks +0% synergy
Illusionist's Bracers
19% of 21 decks +18% synergy
Druidic Satchel
14% of 21 decks +14% synergy
Eldrazi Monument
14% of 21 decks +13% synergy
Thousand-Year Elixir
14% of 21 decks +12% synergy
Lightning Greaves
14% of 21 decks -11% synergy
Enchantments (20)
Fungal Plots
62% of 21 decks +62% synergy
Doubling Season
57% of 21 decks +53% synergy
Intruder Alarm
43% of 21 decks +42% synergy
Inexorable Tide
43% of 21 decks +42% synergy
Fungal Bloom
38% of 21 decks +38% synergy
Paradox Haze
38% of 21 decks +37% synergy
Moldervine Reclamation
33% of 21 decks +31% synergy
Anointed Procession
33% of 9 decks +29% synergy
Growing Rites of Itlimoc
29% of 21 decks +26% synergy
Reflections of Littjara
29% of 21 decks +26% synergy
Evolutionary Leap
24% of 21 decks +23% synergy
Sporogenesis
19% of 21 decks +19% synergy
Life and Limb
19% of 21 decks +19% synergy
Necrogenesis
19% of 21 decks +19% synergy
Verdant Embrace
19% of 21 decks +19% synergy
Cryptolith Rite
19% of 21 decks +17% synergy
Parallel Lives
19% of 21 decks +16% synergy
Phyrexian Arena
19% of 21 decks +12% synergy
Elven Chorus
18% of 17 decks +15% synergy
Bastion of Remembrance
14% of 21 decks +11% synergy
Planeswalkers (1)
Vraska, Betrayal's Sting
29% of 21 decks +26% synergy
Utility Lands (5)
Karn's Bastion
48% of 21 decks +43% synergy
Reliquary Tower
24% of 21 decks -4% synergy
Nesting Grounds
19% of 21 decks +18% synergy
Yavimaya, Cradle of Growth
19% of 21 decks +10% synergy
Oran-Rief, the Vastwood
14% of 21 decks +12% synergy
Mana Artifacts (6)
Sol Ring
71% of 21 decks -13% synergy
Arcane Signet
62% of 21 decks -9% synergy
Astral Cornucopia
29% of 21 decks +27% synergy
Staff of Compleation
29% of 21 decks +27% synergy
Everflowing Chalice
29% of 21 decks +24% synergy
Talisman of Resilience
14% of 21 decks +12% synergy
Lands (33)
Command Tower
67% of 21 decks -6% synergy
Breeding Pool
52% of 21 decks +43% synergy
Indatha Triome
44% of 9 decks +41% synergy
Raffine's Tower
44% of 9 decks +41% synergy
Spara's Headquarters
44% of 9 decks +40% synergy
Bountiful Promenade
44% of 9 decks +39% synergy
Sea of Clouds
44% of 9 decks +39% synergy
Temple Garden
44% of 9 decks +35% synergy
Undergrowth Stadium
43% of 21 decks +37% synergy
Overgrown Tomb
43% of 21 decks +33% synergy
Exotic Orchard
43% of 21 decks +8% synergy
Zagoth Triome
38% of 21 decks +34% synergy
Watery Grave
33% of 21 decks +23% synergy
Opulent Palace
29% of 21 decks +26% synergy
Deathcap Glade
29% of 21 decks +25% synergy
Woodland Cemetery
29% of 21 decks +23% synergy
Rejuvenating Springs
29% of 21 decks +22% synergy
Dreamroot Cascade
24% of 21 decks +20% synergy
Morphic Pool
24% of 21 decks +17% synergy
Barkchannel Pathway
19% of 21 decks +17% synergy
Llanowar Wastes
19% of 21 decks +14% synergy
Hinterland Harbor
19% of 21 decks +14% synergy
Yavimaya Coast
19% of 21 decks +14% synergy
Drowned Catacomb
19% of 21 decks +13% synergy
Sunken Hollow
19% of 21 decks +10% synergy
Polluted Delta
19% of 21 decks +8% synergy
Verdant Catacombs
19% of 21 decks +7% synergy
Path of Ancestry
19% of 21 decks -1% synergy
Darkbore Pathway
14% of 21 decks +12% synergy
Shipwreck Marsh
14% of 21 decks +9% synergy
Fabled Passage
14% of 21 decks +5% synergy
Misty Rainforest
14% of 21 decks +2% synergy
Evolving Wilds
14% of 21 decks -7% synergy