Sporoloth Ancient + Tainted Observer + Ashnod's Altar + Doubling Season

Sporoloth Ancient
Tainted Observer
Ashnod's Altar
Doubling Season

Requires
Sporoloth Ancient must be on the battlefield. Tainted Observer must be on the battlefield. Ashnod's Altar must be on the battlefield. Doubling Season 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 two 1/1 Saproling creature tokens.
  2. The Saprolings enter the battlefield, triggering Tainted Observer twice.
  3. Holding priority, activate Ashnod's Altar by sacrificing a Saproling, adding .
  4. Resolve the first Tainted Observer trigger, causing you to pay 2 to put two spore counters on any creature you control.
  5. Resolve the second Tainted Observer trigger, choosing not to pay.
  6. Repeat.
Results
Infinite colorless mana. Infinite creature tokens. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite proliferate. Infinite sacrifice triggers.

Atraxa, Praetors' Voice
0.03% of 35211 decks 10 decks
Xavier Sal, Infested Captain
0.20% of 4399 decks 9 decks
High Synergy Cards
Mycologist
100% of 10 decks +100% synergy
Sporesower Thallid
100% of 19 decks +100% synergy
Psychotrope Thallid
100% of 19 decks +100% synergy
Deathspore Thallid
100% of 19 decks +99% synergy
Utopia Mycon
100% of 19 decks +99% synergy
Slimefoot, the Stowaway
100% of 19 decks +98% synergy
Vitaspore Thallid
95% of 19 decks +94% synergy
Mycoloth
89% of 19 decks +88% synergy
Nemata, Primeval Warden
89% of 19 decks +87% synergy
Thallid Shell-Dweller
84% of 19 decks +84% synergy
Top Cards
Thallid
84% of 19 decks +84% synergy
Pallid Mycoderm
80% of 10 decks +80% synergy
Ghave, Guru of Spores
80% of 10 decks +79% synergy
Thallid Germinator
79% of 19 decks +79% synergy
Thelon of Havenwood
79% of 19 decks +78% synergy
Elvish Farmer
74% of 19 decks +74% synergy
Spore Flower
74% of 19 decks +74% synergy
Savage Thallid
74% of 19 decks +73% synergy
Tendershoot Dryad
74% of 19 decks +71% synergy
Tekuthal, Inquiry Dominus
74% of 19 decks +71% synergy
Creatures
Brightcap Badger
100% of 3 decks +98% synergy
Dreamtide Whale
100% of 3 decks +96% synergy
Winding Constrictor
74% of 19 decks +70% synergy
Lae'zel, Vlaakith's Champion
60% of 10 decks +57% synergy
Mondrak, Glory Dominus
60% of 10 decks +51% synergy
Ezuri, Stalker of Spheres
58% of 19 decks +54% synergy
Evolution Sage
58% of 19 decks +51% synergy
Xavier Sal, Infested Captain
54% of 13 decks +52% synergy
Thallid Devourer
53% of 19 decks +52% synergy
Cankerbloom
53% of 19 decks +45% synergy
Roaming Throne
50% of 14 decks +40% synergy
Pir, Imaginative Rascal
47% of 19 decks +46% synergy
The Mycotyrant
47% of 15 decks +45% synergy
Sporecrown Thallid
37% of 19 decks +36% synergy
Vorinclex, Monstrous Raider
37% of 19 decks +33% synergy
Thorn Thallid
32% of 19 decks +32% synergy
Nemata, Grove Guardian
32% of 19 decks +31% synergy
Undercellar Myconid
32% of 19 decks +31% synergy
Sporemound
32% of 19 decks +30% synergy
Yawgmoth, Thran Physician
32% of 19 decks +28% synergy
Zulaport Cutthroat
32% of 19 decks +22% synergy
Blood Artist
32% of 19 decks +20% synergy
Mirkwood Bats
29% of 17 decks +17% synergy
Scheming Aspirant
26% of 19 decks +26% synergy
Thrummingbird
26% of 19 decks +23% synergy
Danny Pink
25% of 16 decks +23% synergy
Thallid Soothsayer
21% of 19 decks +21% synergy
Plaguemaw Beast
21% of 19 decks +21% synergy
Verdant Force
21% of 19 decks +20% synergy
Mindbender Spores
16% of 19 decks +16% synergy
Verdeloth the Ancient
16% of 19 decks +15% synergy
Kiora's Follower
16% of 19 decks +10% synergy
Pitiless Plunderer
16% of 19 decks +8% synergy
Instants
Aura Mutation
70% of 10 decks +66% synergy
Atomize
60% of 5 decks +54% synergy
Ripples of Potential
54% of 13 decks +50% synergy
Sprout Swarm
53% of 19 decks +52% synergy
Assassin's Trophy
37% of 19 decks +7% synergy
Steady Progress
26% of 19 decks +25% synergy
Heroic Intervention
26% of 19 decks -3% synergy
Serum Snare
21% of 19 decks +20% synergy
Experimental Augury
21% of 19 decks +18% synergy
Village Rites
21% of 19 decks +11% synergy
Beast Within
21% of 19 decks -18% synergy
Fungal Rebirth
16% of 19 decks +15% synergy
Fuel for the Cause
16% of 19 decks +15% synergy
Cackling Counterpart
16% of 19 decks +14% synergy
Growth Spiral
16% of 19 decks -6% synergy
Cyclonic Rift
16% of 19 decks -12% synergy
Sorceries
Unnatural Restoration
53% of 19 decks +49% synergy
Farseek
53% of 19 decks +18% synergy
Saproling Symbiosis
47% of 19 decks +47% synergy
Tezzeret's Gambit
47% of 19 decks +44% synergy
Nature's Lore
42% of 19 decks +10% synergy
Three Visits
37% of 19 decks +12% synergy
Cultivate
32% of 19 decks -15% synergy
Fungal Sprouting
21% of 19 decks +20% synergy
Kodama's Reach
21% of 19 decks -11% synergy
Rampant Growth
21% of 19 decks -14% synergy
Contentious Plan
16% of 19 decks +14% synergy
Overwhelming Stampede
16% of 19 decks +10% synergy
Bala Ged Recovery
16% of 19 decks +7% synergy
Toxic Deluge
16% of 19 decks -2% synergy
Utility Artifacts
Skullclamp
63% of 19 decks +51% synergy
Phyrexian Altar
42% of 19 decks +38% synergy
The Ozolith
32% of 19 decks +28% synergy
Contagion Engine
26% of 19 decks +25% synergy
Eldrazi Monument
26% of 19 decks +25% synergy
Lightning Greaves
21% of 19 decks -4% synergy
Contagion Clasp
16% of 19 decks +14% synergy
Thousand-Year Elixir
16% of 19 decks +14% synergy
Swiftfoot Boots
16% of 19 decks -12% synergy
Enchantments
Fungal Plots
68% of 19 decks +68% synergy
Anointed Procession
50% of 10 decks +41% synergy
Paradox Haze
47% of 19 decks +46% synergy
Fungal Bloom
42% of 19 decks +42% synergy
Intruder Alarm
37% of 19 decks +35% synergy
Inexorable Tide
37% of 19 decks +34% synergy
Growing Rites of Itlimoc
32% of 19 decks +26% synergy
Reflections of Littjara
26% of 19 decks +21% synergy
Moldervine Reclamation
26% of 19 decks +17% synergy
Life and Limb
21% of 19 decks +21% synergy
Verdant Embrace
21% of 19 decks +20% synergy
Necrogenesis
21% of 19 decks +20% synergy
Beastmaster Ascension
21% of 19 decks +15% synergy
Parallel Lives
21% of 19 decks +14% synergy
Utility Lands
Karn's Bastion
53% of 19 decks +48% synergy
Yavimaya, Cradle of Growth
42% of 19 decks +33% synergy
Vitu-Ghazi, the City-Tree
40% of 10 decks +39% synergy
Nesting Grounds
37% of 19 decks +35% synergy
Reliquary Tower
26% of 19 decks -3% synergy
Oran-Rief, the Vastwood
21% of 19 decks +16% synergy
Grim Backwoods
16% of 19 decks +12% synergy
Phyrexian Tower
16% of 19 decks +7% synergy
Otawara, Soaring City
16% of 19 decks -1% synergy
Boseiju, Who Endures
16% of 19 decks -4% synergy
Mana Artifacts
Sol Ring
68% of 19 decks -16% synergy
Arcane Signet
42% of 19 decks -30% synergy
Everflowing Chalice
21% of 19 decks +16% synergy
Astral Cornucopia
16% of 19 decks +15% synergy
Replicating Ring
16% of 19 decks +14% synergy
Staff of Compleation
16% of 19 decks +14% synergy
Talisman of Curiosity
16% of 19 decks +3% synergy
Lands
Command Tower
84% of 19 decks +10% synergy
Exotic Orchard
74% of 19 decks +38% synergy
Bountiful Promenade
70% of 10 decks +46% synergy
Temple Garden
70% of 10 decks +29% synergy
Breeding Pool
63% of 19 decks +22% synergy
Indatha Triome
60% of 10 decks +29% synergy
Spara's Headquarters
60% of 10 decks +28% synergy
Zagoth Triome
53% of 19 decks +22% synergy
Overgrown Tomb
53% of 19 decks +10% synergy
Undergrowth Stadium
47% of 19 decks +21% synergy
Rejuvenating Springs
42% of 19 decks +13% synergy
Sea of Clouds
40% of 10 decks +14% synergy
Woodland Cemetery
37% of 19 decks +9% synergy
Raffine's Tower
30% of 10 decks +2% synergy
Godless Shrine
30% of 10 decks -11% synergy
Verdant Catacombs
26% of 19 decks +15% synergy
Deathcap Glade
26% of 19 decks +12% synergy
Dreamroot Cascade
26% of 19 decks +8% synergy
Path of Ancestry
26% of 19 decks +5% synergy
Llanowar Wastes
26% of 19 decks +1% synergy
Hinterland Harbor
26% of 19 decks -1% synergy
Watery Grave
26% of 19 decks -15% synergy
Fabled Passage
21% of 19 decks +12% synergy
Marsh Flats
21% of 19 decks +10% synergy
Morphic Pool
21% of 19 decks -5% synergy
Reflecting Pool
16% of 19 decks +10% synergy
Mana Confluence
16% of 19 decks +8% synergy
Darkbore Pathway
16% of 19 decks +7% synergy
Barkchannel Pathway
16% of 19 decks +7% synergy
Twilight Mire
16% of 19 decks +6% synergy
Windswept Heath
16% of 19 decks +5% synergy
Flooded Strand
16% of 19 decks +5% synergy
Polluted Delta
16% of 19 decks +5% synergy
Golgari Rot Farm
16% of 19 decks -2% synergy
Yavimaya Coast
16% of 19 decks -11% synergy
Sunken Hollow
16% of 19 decks -19% synergy