Prowling Geistcatcher + Kiki-Jiki, Mirror Breaker + Phyrexian Altar

Prowling Geistcatcher
Kiki-Jiki, Mirror Breaker
Phyrexian Altar

Requires
Prowling Geistcatcher must be on the battlefield. Kiki-Jiki, Mirror Breaker must be on the battlefield. Phyrexian Altar must be on the battlefield.
Steps
  1. Activate Kiki-Jiki by tapping it, creating a token copy of Prowling Geistcatcher with haste.
  2. Activate Phyrexian Altar by sacrificing Kiki-Jiki, adding one mana of any color.
  3. When Kiki-Jiki dies, the nontoken and token Prowling Geistcatcher's first abilities trigger.
  4. Resolve the token Prowling Geistcatcher's trigger, exiling Kiki-Jiki from your graveyard.
  5. Resolve the nontoken Prowling Geistcatcher's trigger, doing nothing.
  6. Activate Phyrexian Altar by sacrificing the Prowling Geistcatcher token, adding one mana of any color.
  7. When the token Prowling Geistcatcher dies, its second ability and the nontoken Prowling Geistcatcher's first ability triggers.
  8. Resolve the nontoken Prowling Geistcatcher trigger, putting a +1/+1 counter on it.
  9. Resolve the token Prowling Geistcatcher trigger, returning Kiki-Jiki from exile to the battlefield.
  10. Repeat.
Results
Infinite +1/+1 counters on Prowling Geistcatcher. Infinite colored mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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50% of 64 decks +23% synergy
Bloodstained Mire
47% of 64 decks +36% synergy
Haunted Ridge
47% of 64 decks +31% synergy
Battlefield Forge
47% of 15 decks +21% synergy
Blightstep Pathway
44% of 64 decks +34% synergy
Smoldering Marsh
44% of 64 decks +11% synergy
Elegant Parlor
43% of 7 decks +33% synergy
Shadowy Backstreet
43% of 7 decks +29% synergy
Sulfurous Springs
41% of 64 decks +21% synergy
Isolated Chapel
40% of 15 decks +13% synergy
Clifftop Retreat
40% of 15 decks +13% synergy
Exotic Orchard
38% of 64 decks +2% synergy
Nomad Outpost
33% of 15 decks +6% synergy
Caves of Koilos
33% of 15 decks +5% synergy
Arid Mesa
31% of 64 decks +21% synergy
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28% of 64 decks +17% synergy
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27% of 22 decks +14% synergy
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27% of 15 decks +17% synergy
Brightclimb Pathway
27% of 15 decks +16% synergy
Scrubland
27% of 15 decks +13% synergy
Tainted Peak
27% of 64 decks +17% synergy
Foreboding Ruins
27% of 64 decks +11% synergy
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25% of 12 decks +23% synergy
Rakdos Carnarium
25% of 64 decks +10% synergy
Graven Cairns
23% of 64 decks +16% synergy
Wooded Foothills
23% of 64 decks +13% synergy
Badlands
23% of 64 decks +10% synergy
Temple of Malice
23% of 64 decks +9% synergy
Mount Doom
23% of 47 decks +16% synergy
Shadowblood Ridge
22% of 64 decks +10% synergy
Verdant Catacombs
20% of 64 decks +9% synergy
Rugged Prairie
20% of 15 decks +10% synergy
Plateau
20% of 15 decks +7% synergy
Sundown Pass
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Scalding Tarn
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