Crypt Champion + Fiend Hunter + Phyrexian Altar
Crypt Champion
Fiend Hunter
Phyrexian Altar
Requires
Crypt Champion must be on the battlefield.
Fiend Hunter must be in hand.
Phyrexian Altar must be on the battlefield.
Mana needed: 
Steps
- Cast Fiend Hunter by paying .
- Fiend Hunter enters the battlefield, exiling Crypt Champion.
- Activate Phyrexian Altar by sacrificing Fiend Hunter, adding one mana of any color.
- Fiend Hunter leaves the battlefield, returning Crypt Champion from exile to the battlefield.
- Crypt Champion enters the battlefield, triggering its first and second abilities.
- Resolve the first Crypt Champion trigger, returning Fiend Hunter from your graveyard to the battlefield.
- Repeat from step 2.
Results
Infinite colored mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.
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+24% synergy
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Blightstep Pathway
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+15% synergy
Brightclimb Pathway
25% of 4 decks
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Flooded Strand
25% of 4 decks
+14% synergy
Plateau
25% of 4 decks
+12% synergy
Shattered Sanctum
25% of 4 decks
+12% synergy
Badlands
25% of 4 decks
+11% synergy
Scrubland
25% of 4 decks
+11% synergy
Terramorphic Expanse
25% of 4 decks
+9% synergy
Haunted Ridge
25% of 4 decks
+9% synergy
Temple of Silence
25% of 4 decks
+7% synergy
Sulfurous Springs
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+5% synergy