Tainted Observer + Animation Module + Crystalline Crawler + Doubling Season + Tekuthal, Inquiry Dominus
Tainted Observer
Animation Module
Crystalline Crawler
Doubling Season
Tekuthal, Inquiry Dominus
Requires
Tainted Observer must be on the battlefield.
Animation Module must be on the battlefield.
Crystalline Crawler must be on the battlefield.
Doubling Season must be on the battlefield.
Tekuthal, Inquiry Dominus must be on the battlefield.
Crystalline Crawler has at least one +1/+1 counter.
You have a way to put a +1/+1 counter on a creature you control.
Mana needed: 
Steps
- Put a +1/+1 counter on a creature you control.
- Animation Module triggers, causing you to pay
to create a 1/1 Servo artifact creature token. - The Servo enters the battlefield, triggering Tainted Observer, causing you to pay
to put four +1/+1 counters on Crystalline Crawler. - Animation Module triggers four times.
- Resolve the first three Animation Module triggers, choosing not to pay.
- Activate Crystalline Crawler's first ability three times by removing three +1/+1 counters from it, adding .
- Resolve the final Animation Module trigger, causing you to pay to create a 1/1 Servo artifact creature token.
- Repeat from step 3.
Results
Infinite +1/+1 counters on Crystalline Crawler. Infinite colored mana. Infinite creature tokens. Infinite ETB. Infinite proliferate.
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17% of 6 decks
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17% of 6 decks
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17% of 6 decks
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17% of 6 decks
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17% of 6 decks
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Lands
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50% of 6 decks
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50% of 6 decks
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50% of 6 decks
+14% synergy
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33% of 6 decks
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33% of 6 decks
+23% synergy
Marsh Flats
33% of 6 decks
+22% synergy
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33% of 6 decks
+22% synergy
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33% of 3 decks
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33% of 3 decks
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33% of 3 decks
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Underground Sea
33% of 3 decks
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Azorius Chancery
33% of 3 decks
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Overgrown Farmland
33% of 3 decks
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Dimir Aqueduct
33% of 3 decks
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Simic Growth Chamber
33% of 6 decks
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Vault of Champions
33% of 3 decks
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Sea of Clouds
33% of 3 decks
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Morphic Pool
33% of 3 decks
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Undergrowth Stadium
33% of 3 decks
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Hinterland Harbor
33% of 6 decks
+6% synergy
Raffine's Tower
33% of 3 decks
+6% synergy
Rejuvenating Springs
33% of 6 decks
+5% synergy
Zagoth Triome
33% of 3 decks
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Prairie Stream
33% of 3 decks
-0% synergy
Gemstone Mine
17% of 6 decks
+16% synergy
Vivid Creek
17% of 6 decks
+15% synergy
Vivid Grove
17% of 6 decks
+15% synergy
Littjara Mirrorlake
17% of 6 decks
+15% synergy
Opal Palace
17% of 6 decks
+14% synergy
Plaza of Heroes
17% of 6 decks
+13% synergy
Botanical Sanctum
17% of 6 decks
+13% synergy
Reflecting Pool
17% of 6 decks
+11% synergy
Mana Confluence
17% of 6 decks
+9% synergy
Waterlogged Grove
17% of 6 decks
+9% synergy
Fabled Passage
17% of 6 decks
+8% synergy
Wooded Foothills
17% of 6 decks
+6% synergy
Bloodstained Mire
17% of 6 decks
+6% synergy
Vineglimmer Snarl
17% of 6 decks
+6% synergy