Dockside Extortionist + Underworld Breach + Grinding Station + Viscera Seer
Dockside Extortionist
Underworld Breach
Grinding Station
Viscera Seer
Requires
Dockside Extortionist must be in hand, or in the graveyard.
Underworld Breach must be on the battlefield.
Grinding Station must be on the battlefield.
Viscera Seer must be on the battlefield.
You have at least three additional cards in your graveyard if Dockside Extortionist is in your graveyard.
Opponents control at least three artifacts and/or enchantments.
Mana needed: 
Steps
- Cast Dockside Extortionist either from your hand by paying or from your graveyard for its escape cost by paying and exiling three other cards from your graveyard.
- Dockside Extortionist enters the battlefield, creating at least three Treasure tokens.
- The Treasures enter the battlefield, triggering Grinding Station that many times, untapping Grinding Station.
- Activate Grinding Station by sacrificing a Treasure, causing you to mill three cards.
- Activate Viscera Seer by sacrificing Dockside Extortionist, causing you to scry 1.
- Activate two Treasures by tapping and sacrificing them, adding .
- Repeat.
- If opponents control four or more artifacts/enchantments, this combo will net near-infinite Treasure tokens and colored mana.
Results
Infinite self-mill. Near-infinite colored mana. Near-infinite death triggers. Near-infinite ETB. Near-infinite LTB. Near-infinite mill. Near-infinite sacrifice triggers. Near-infinite storm count. Near-infinite Treasure tokens.
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56% of 448 decks
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35% of 448 decks
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30% of 207 decks
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27% of 70 decks
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Lands
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91% of 448 decks
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Verdant Catacombs
82% of 448 decks
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79% of 24 decks
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Marsh Flats
78% of 448 decks
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Arid Mesa
77% of 448 decks
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76% of 70 decks
+62% synergy
Wooded Foothills
75% of 448 decks
+65% synergy
City of Brass
75% of 448 decks
+67% synergy
Steam Vents
75% of 24 decks
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Mana Confluence
75% of 448 decks
+68% synergy
Scalding Tarn
74% of 448 decks
+64% synergy
Polluted Delta
74% of 448 decks
+63% synergy
Badlands
74% of 448 decks
+61% synergy
Plateau
71% of 70 decks
+59% synergy
Taiga
71% of 207 decks
+58% synergy
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71% of 207 decks
+58% synergy
Hallowed Fountain
69% of 13 decks
+29% synergy
Luxury Suite
69% of 448 decks
+43% synergy
Gemstone Caverns
68% of 448 decks
+63% synergy
Temple Garden
67% of 9 decks
+27% synergy
Undergrowth Stadium
58% of 207 decks
+32% synergy
Exotic Orchard
55% of 448 decks
+19% synergy
Tundra
54% of 13 decks
+40% synergy
Vault of Champions
51% of 70 decks
+26% synergy
Underground Sea
50% of 24 decks
+36% synergy
Spire Garden
48% of 207 decks
+24% synergy
Spectator Seating
44% of 70 decks
+20% synergy
Volcanic Island
42% of 24 decks
+28% synergy
Windswept Heath
41% of 448 decks
+30% synergy
Misty Rainforest
37% of 448 decks
+26% synergy
Sulfurous Springs
37% of 448 decks
+16% synergy
Mount Doom
32% of 436 decks
+26% synergy
Nurturing Peatland
30% of 207 decks
+25% synergy
Training Center
29% of 24 decks
+2% synergy
Shivan Reef
29% of 24 decks
+2% synergy
Raucous Theater
29% of 276 decks
+19% synergy
Underground River
25% of 24 decks
+4% synergy
Drowned Catacomb
25% of 24 decks
-2% synergy
Forbidden Orchard
24% of 448 decks
+21% synergy
Ziatora's Proving Ground
23% of 207 decks
-7% synergy
Cavern of Souls
21% of 448 decks
+14% synergy