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 .
  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.

Xavier Sal, Infested Captain
0.34% of 4399 decks 15 decks
Atraxa, Praetors' Voice
0.03% of 35211 decks 10 decks
High Synergy Cards
Psychotrope Thallid
100% of 25 decks +100% synergy
Deathspore Thallid
100% of 25 decks +99% synergy
Slimefoot, the Stowaway
100% of 25 decks +98% synergy
Utopia Mycon
96% of 25 decks +95% synergy
Vitaspore Thallid
92% of 25 decks +92% synergy
Sporesower Thallid
92% of 25 decks +92% synergy
Mycoloth
92% of 25 decks +90% synergy
Mycologist
90% of 10 decks +90% synergy
Thallid
88% of 25 decks +88% synergy
Pallid Mycoderm
80% of 10 decks +80% synergy
Top Cards
Ghave, Guru of Spores
80% of 10 decks +79% synergy
Nemata, Primeval Warden
80% of 25 decks +77% synergy
Spore Flower
76% of 25 decks +76% synergy
Thelon of Havenwood
76% of 25 decks +76% synergy
Savage Thallid
72% of 25 decks +72% synergy
Thallid Germinator
72% of 25 decks +72% synergy
Thallid Shell-Dweller
72% of 25 decks +72% synergy
Ezuri, Stalker of Spheres
72% of 25 decks +68% synergy
Winding Constrictor
72% of 25 decks +68% synergy
Evolution Sage
72% of 25 decks +65% synergy
Creatures
Dreamtide Whale
100% of 3 decks +96% synergy
Elvish Farmer
68% of 25 decks +68% synergy
Tendershoot Dryad
64% of 25 decks +62% synergy
Cankerbloom
60% of 25 decks +53% synergy
Mondrak, Glory Dominus
60% of 10 decks +51% synergy
Sporecrown Thallid
56% of 25 decks +55% synergy
Thrummingbird
56% of 25 decks +52% synergy
Lae'zel, Vlaakith's Champion
50% of 10 decks +47% synergy
Thallid Devourer
48% of 25 decks +48% synergy
Mirkwood Bats
48% of 21 decks +35% synergy
Undercellar Myconid
40% of 25 decks +39% synergy
Grateful Apparition
40% of 10 decks +38% synergy
The Mycotyrant
39% of 18 decks +37% synergy
Xavier Sal, Infested Captain
38% of 13 decks +37% synergy
Nemata, Grove Guardian
36% of 25 decks +36% synergy
Pir, Imaginative Rascal
36% of 25 decks +35% synergy
Yawgmoth, Thran Physician
36% of 25 decks +32% synergy
Vorinclex, Monstrous Raider
36% of 25 decks +32% synergy
Blood Artist
36% of 25 decks +24% synergy
Roaming Throne
33% of 15 decks +23% synergy
Zulaport Cutthroat
32% of 25 decks +22% synergy
Norn's Choirmaster
30% of 10 decks +28% synergy
Scheming Aspirant
29% of 24 decks +28% synergy
Thorn Thallid
28% of 25 decks +28% synergy
Plaguemaw Beast
28% of 25 decks +28% synergy
Pitiless Plunderer
28% of 25 decks +20% synergy
Birds of Paradise
28% of 25 decks +1% synergy
Danny Pink
26% of 19 decks +25% synergy
Sporemound
24% of 25 decks +22% synergy
Verdeloth the Ancient
20% of 25 decks +20% synergy
Mazirek, Kraul Death Priest
20% of 25 decks +17% synergy
Mindbender Spores
16% of 25 decks +16% synergy
Thallid Soothsayer
16% of 25 decks +16% synergy
Deepglow Skate
16% of 25 decks +14% synergy
Flux Channeler
16% of 25 decks +13% synergy
Adrix and Nev, Twincasters
16% of 25 decks +11% synergy
Kiora's Follower
16% of 25 decks +10% synergy
Myconid Spore Tender
12% of 25 decks +12% synergy
Bloodspore Thrinax
12% of 25 decks +12% synergy
Roalesk, Apex Hybrid
12% of 25 decks +11% synergy
Sphinx of the Second Sun
12% of 25 decks +10% synergy
Vorel of the Hull Clade
12% of 25 decks +9% synergy
Corpsejack Menace
12% of 25 decks +7% synergy
Instants
Aura Mutation
60% of 10 decks +56% synergy
Mutational Advantage
60% of 5 decks +54% synergy
Ripples of Potential
54% of 13 decks +50% synergy
Counterspell
40% of 25 decks -3% synergy
Sprout Swarm
32% of 25 decks +32% synergy
Experimental Augury
32% of 25 decks +29% synergy
Beast Within
32% of 25 decks -7% synergy
Teferi's Protection
30% of 10 decks +10% synergy
Fungal Rebirth
28% of 25 decks +27% synergy
Village Rites
28% of 25 decks +18% synergy
Assassin's Trophy
28% of 25 decks -2% synergy
Heroic Intervention
24% of 25 decks -6% synergy
Fuel for the Cause
20% of 25 decks +19% synergy
Steady Progress
20% of 25 decks +19% synergy
Growth Spiral
20% of 25 decks -2% synergy
Reject Imperfection
17% of 24 decks +15% synergy
Serum Snare
17% of 24 decks +15% synergy
Deadly Dispute
16% of 25 decks +5% synergy
Cyclonic Rift
16% of 25 decks -12% synergy
Grim Affliction
12% of 25 decks +11% synergy
Putrefy
12% of 25 decks -4% synergy
Sorceries
Farseek
60% of 25 decks +26% synergy
Tezzeret's Gambit
52% of 25 decks +48% synergy
Unnatural Restoration
52% of 25 decks +48% synergy
Cultivate
40% of 25 decks -6% synergy
Saproling Symbiosis
36% of 25 decks +35% synergy
Kodama's Reach
32% of 25 decks +0% synergy
Rampant Growth
32% of 25 decks -3% synergy
Nature's Lore
28% of 25 decks -4% synergy
Drown in Ichor
24% of 25 decks +21% synergy
Three Visits
24% of 25 decks -1% synergy
Contentious Plan
20% of 25 decks +18% synergy
Thirsting Roots
16% of 25 decks +14% synergy
Toxic Deluge
16% of 25 decks -1% synergy
Aether Mutation
12% of 25 decks +12% synergy
Carnivorous Canopy
12% of 25 decks +11% synergy
Infectious Inquiry
12% of 25 decks +9% synergy
Damnation
12% of 25 decks +4% synergy
Bala Ged Recovery
12% of 25 decks +3% synergy
Utility Artifacts
Skullclamp
60% of 25 decks +48% synergy
Contagion Engine
28% of 25 decks +27% synergy
Contagion Clasp
28% of 25 decks +27% synergy
Phyrexian Altar
28% of 25 decks +24% synergy
The Ozolith
24% of 25 decks +21% synergy
Swiftfoot Boots
24% of 25 decks -4% synergy
Eldrazi Monument
20% of 25 decks +19% synergy
Lightning Greaves
20% of 25 decks -5% synergy
Illusionist's Bracers
16% of 25 decks +15% synergy
Druidic Satchel
12% of 25 decks +12% synergy
Thousand-Year Elixir
12% of 25 decks +10% synergy
Enchantments
Fungal Plots
64% of 25 decks +63% synergy
Doubling Season
56% of 25 decks +47% synergy
Paradox Haze
44% of 25 decks +42% synergy
Intruder Alarm
44% of 25 decks +42% synergy
Inexorable Tide
40% of 25 decks +37% synergy
Anointed Procession
40% of 10 decks +31% synergy
Fungal Bloom
32% of 25 decks +32% synergy
Growing Rites of Itlimoc
32% of 25 decks +26% synergy
Moldervine Reclamation
32% of 25 decks +23% synergy
Reflections of Littjara
24% of 25 decks +19% synergy
Sporogenesis
20% of 25 decks +20% synergy
Life and Limb
20% of 25 decks +20% synergy
Necrogenesis
20% of 25 decks +19% synergy
Evolutionary Leap
20% of 25 decks +18% synergy
Verdant Embrace
16% of 25 decks +15% synergy
Parallel Lives
16% of 25 decks +9% synergy
Phyrexian Arena
16% of 25 decks +1% synergy
Primal Vigor
12% of 25 decks +9% synergy
Cryptolith Rite
12% of 25 decks +8% synergy
Beastmaster Ascension
12% of 25 decks +6% synergy
Bastion of Remembrance
12% of 25 decks +6% synergy
Wild Growth
12% of 25 decks +1% synergy
Mystic Remora
12% of 25 decks -6% synergy
Planeswalkers
Vraska, Betrayal's Sting
28% of 25 decks +24% synergy
Tyvar, Jubilant Brawler
12% of 25 decks +7% synergy
Utility Lands
Karn's Bastion
44% of 25 decks +39% synergy
Yavimaya, Cradle of Growth
24% of 25 decks +15% synergy
Nesting Grounds
16% of 25 decks +15% synergy
Phyrexian Tower
16% of 25 decks +8% synergy
Reliquary Tower
16% of 25 decks -13% synergy
Oran-Rief, the Vastwood
12% of 25 decks +7% synergy
Boseiju, Who Endures
12% of 25 decks -8% synergy
Bojuka Bog
12% of 25 decks -18% synergy
Mana Artifacts
Sol Ring
68% of 25 decks -16% synergy
Arcane Signet
56% of 25 decks -16% synergy
Astral Cornucopia
32% of 25 decks +31% synergy
Staff of Compleation
32% of 25 decks +30% synergy
Everflowing Chalice
32% of 25 decks +27% synergy
Lands
Command Tower
76% of 25 decks +2% synergy
Bountiful Promenade
60% of 10 decks +36% synergy
Sea of Clouds
60% of 10 decks +34% synergy
Exotic Orchard
52% of 25 decks +16% synergy
Breeding Pool
52% of 25 decks +11% synergy
Indatha Triome
50% of 10 decks +19% synergy
Spara's Headquarters
50% of 10 decks +18% synergy
Temple Garden
50% of 10 decks +9% synergy
Undergrowth Stadium
40% of 25 decks +14% synergy
Raffine's Tower
40% of 10 decks +12% synergy
Overgrown Tomb
40% of 25 decks -3% synergy
Woodland Cemetery
36% of 25 decks +8% synergy
Zagoth Triome
36% of 25 decks +5% synergy
Watery Grave
36% of 25 decks -5% synergy
Rejuvenating Springs
32% of 25 decks +3% synergy
Vault of Champions
30% of 10 decks +4% synergy
Godless Shrine
30% of 10 decks -11% synergy
Verdant Catacombs
28% of 25 decks +17% synergy
Morphic Pool
28% of 25 decks +2% synergy
Opulent Palace
28% of 25 decks +1% synergy
Deathcap Glade
24% of 25 decks +10% synergy
Path of Ancestry
24% of 25 decks +3% synergy
Llanowar Wastes
24% of 25 decks -2% synergy
Sunken Hollow
24% of 25 decks -11% synergy
Polluted Delta
20% of 25 decks +9% synergy
Dreamroot Cascade
20% of 25 decks +1% synergy
Evolving Wilds
20% of 25 decks -1% synergy
Hinterland Harbor
20% of 25 decks -7% synergy
Barkchannel Pathway
16% of 25 decks +7% synergy
Marsh Flats
16% of 25 decks +5% synergy
Terramorphic Expanse
16% of 25 decks +0% synergy
Drowned Catacomb
16% of 25 decks -9% synergy
Yavimaya Coast
16% of 25 decks -10% synergy
Darkbore Pathway
12% of 25 decks +3% synergy
Fabled Passage
12% of 25 decks +3% synergy
Windswept Heath
12% of 25 decks +2% synergy
Flooded Strand
12% of 25 decks +1% synergy
Misty Rainforest
12% of 25 decks +0% synergy
Flooded Grove
12% of 25 decks -0% synergy
Shipwreck Marsh
12% of 25 decks -7% synergy