Chthonian Nightmare + Priest of Gix + Cathodion

Chthonian Nightmare
Priest of Gix
Cathodion

Requires
Chthonian Nightmare must be on the battlefield. Priest of Gix must be in the graveyard. Cathodion must be on the battlefield. You have at least three energy counters.
Steps
  1. Activate Chthonian Nightmare by paying eee, sacrificing Cathodion and returning Chthonian Nightmare from the battlefield to your hand.
  2. When Cathodion dies, it triggers, adding .
  3. Resolve the Chthonian Nightmare ability, returning Priest of Gix from your graveyard to the battlefield.
  4. When Priest of Gix enters the battlefield, it triggers, adding .
  5. Cast Chthonian Nightmare by paying 1.
  6. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get eee.
  7. Activate Chthonian Nightmare by paying eee, sacrificing Priest of Gix and returning Chthonian Nightmare from the battlefield to your hand, returning Cathodion from your graveyard to the battlefield.
  8. Cast Chthonian Nightmare by paying 1.
  9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get eee.
  10. Repeat.
Results
Infinite black mana. Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite storm count.

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Fellwar Stone
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33% of 15 decks +28% synergy
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Mox Diamond
24% of 62 decks +20% synergy
Mox Opal
19% of 62 decks +15% synergy
Grim Monolith
18% of 62 decks +16% synergy
Mind Stone
15% of 62 decks -3% synergy
Mox Amber
13% of 62 decks +9% synergy
Thought Vessel
13% of 62 decks -3% synergy
Lion's Eye Diamond
10% of 62 decks +8% synergy
Springleaf Drum
10% of 62 decks +8% synergy
Solar Transformer
7% of 41 decks +6% synergy
Paradise Mantle
6% of 62 decks +6% synergy
Lands
Temple Garden
75% of 8 decks +66% synergy
Godless Shrine
73% of 15 decks +64% synergy
Sulfurous Springs
71% of 24 decks +66% synergy
Blood Crypt
71% of 24 decks +62% synergy
Command Tower
60% of 62 decks -14% synergy
Vault of Champions
53% of 15 decks +47% synergy
Savannah
50% of 8 decks +47% synergy
Lush Portico
50% of 8 decks +47% synergy
Luxury Suite
50% of 24 decks +44% synergy
Overgrown Tomb
50% of 12 decks +41% synergy
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47% of 15 decks +44% synergy
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39% of 62 decks +27% synergy
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38% of 24 decks +36% synergy
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Arid Mesa
23% of 62 decks +12% synergy
Smoldering Marsh
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Brightclimb Pathway
20% of 15 decks +18% synergy
Shineshadow Snarl
20% of 15 decks +17% synergy
Wooded Foothills
19% of 62 decks +9% synergy
Scalding Tarn
18% of 62 decks +7% synergy
Tainted Peak
17% of 24 decks +15% synergy
Talon Gates of Madara
16% of 38 decks +11% synergy
Spire of Industry
15% of 62 decks +12% synergy
Windswept Heath
13% of 62 decks +3% synergy