Progenitor Mimic + Time Warp + Mnemonic Wall

Progenitor Mimic
Time Warp
Mnemonic Wall

Requires
Progenitor Mimic must be on the battlefield. Time Warp must be on the battlefield. Mnemonic Wall must be on the battlefield. Enough mana available to cast the extra turn spell each turn. Progenitor Mimic is a copy of Mnemonic Wall.
Steps
  1. Cast Time Warp by paying its mana cost, taking an extra turn after this one.
  2. At the beginning of your next upkeep, Progenitor Mimic triggers, creating a token copy of Mnemonic Wall.
  3. When the token Mnemonic Wall enters the battlefield, it triggers itself, returning Time Warp from your graveyard to your hand.
  4. Repeat.
Results
Infinite turns.

Roon of the Hidden Realm
0.13% of 3161 decks 4 decks
Kenrith, the Returned King
0.01% of 21933 decks 2 decks
Rashmi, Eternities Crafter
0.10% of 2004 decks 2 decks
Arcades Sabboth
0.48% of 210 decks 1 decks
Yarok, the Desecrated
0.01% of 10473 decks 1 decks
Arcades, the Strategist
0.01% of 16944 decks 1 decks
Atraxa, Grand Unifier
0.01% of 14880 decks 1 decks
Kruphix, God of Horizons
0.03% of 3154 decks 1 decks
Volo, Guide to Monsters
0.01% of 7619 decks 1 decks
Gandalf, Westward Voyager
0.12% of 831 decks 1 decks
High Synergy Cards
Archaeomancer
67% of 15 decks +63% synergy
Soulherder
67% of 9 decks +61% synergy
Ephemerate
67% of 9 decks +61% synergy
Eternal Witness
80% of 15 decks +59% synergy
Peregrine Drake
60% of 15 decks +57% synergy
Ghostly Flicker
60% of 15 decks +55% synergy
Walk the Aeons
53% of 15 decks +53% synergy
Temporal Manipulation
53% of 15 decks +52% synergy
Brago, King Eternal
56% of 9 decks +52% synergy
Eerie Interlude
56% of 9 decks +51% synergy
Top Cards
Deadeye Navigator
53% of 15 decks +51% synergy
Cyclonic Rift
53% of 15 decks +26% synergy
Counterspell
53% of 15 decks +10% synergy
Teleportation Circle
50% of 8 decks +46% synergy
Time Stretch
47% of 15 decks +45% synergy
Panharmonicon
47% of 15 decks +43% synergy
Mystical Tutor
47% of 15 decks +32% synergy
Cultivate
47% of 15 decks +1% synergy
Yorion, Sky Nomad
44% of 9 decks +42% synergy
Karmic Guide
44% of 9 decks +40% synergy
Creatures
Elesh Norn, Mother of Machines
50% of 6 decks +45% synergy
Thassa, Deep-Dwelling
40% of 15 decks +37% synergy
Acidic Slime
40% of 15 decks +36% synergy
Reveillark
33% of 9 decks +31% synergy
Felidar Guardian
33% of 9 decks +31% synergy
Cloudblazer
33% of 9 decks +30% synergy
Emiel the Blessed
33% of 9 decks +30% synergy
Mulldrifter
33% of 15 decks +28% synergy
Phyrexian Metamorph
33% of 15 decks +26% synergy
Palinchron
27% of 15 decks +26% synergy
Stunt Double
27% of 15 decks +26% synergy
Diluvian Primordial
27% of 15 decks +25% synergy
Wall of Blossoms
27% of 15 decks +25% synergy
Mystic Snake
27% of 15 decks +25% synergy
Timeless Witness
27% of 15 decks +24% synergy
Wood Elves
27% of 15 decks +20% synergy
Coiling Oracle
27% of 15 decks +19% synergy
Birds of Paradise
27% of 15 decks -0% synergy
Salvager of Secrets
20% of 15 decks +20% synergy
Great Whale
20% of 15 decks +20% synergy
Overgrown Battlement
20% of 15 decks +19% synergy
Agent of Treachery
20% of 15 decks +18% synergy
Clever Impersonator
20% of 15 decks +18% synergy
Hornet Queen
20% of 15 decks +17% synergy
Farhaven Elf
20% of 15 decks +16% synergy
Kiora's Follower
20% of 15 decks +14% synergy
Seedborn Muse
20% of 15 decks +12% synergy
Avenger of Zendikar
20% of 15 decks +11% synergy
Reclamation Sage
20% of 15 decks +9% synergy
Solemn Simulacrum
20% of 15 decks +6% synergy
Instants
Lae'zel's Acrobatics
50% of 6 decks +48% synergy
Swords to Plowshares
44% of 9 decks -18% synergy
Arcane Denial
40% of 15 decks +20% synergy
Ghostway
33% of 9 decks +32% synergy
Flicker of Fate
33% of 9 decks +32% synergy
Semester's End
33% of 9 decks +31% synergy
Momentary Blink
33% of 9 decks +30% synergy
Cloudshift
33% of 9 decks +30% synergy
Swan Song
33% of 15 decks +17% synergy
Fierce Guardianship
33% of 15 decks +15% synergy
Growth Spiral
33% of 15 decks +11% synergy
Beast Within
33% of 15 decks -5% synergy
Negate
27% of 15 decks +4% synergy
Illusionist's Stratagem
20% of 15 decks +19% synergy
Displace
20% of 15 decks +18% synergy
Nature's Claim
20% of 15 decks +11% synergy
Force of Will
20% of 15 decks +9% synergy
Worldly Tutor
20% of 15 decks +6% synergy
Brainstorm
20% of 15 decks -1% synergy
Heroic Intervention
20% of 15 decks -10% synergy
Sorceries
Rampant Growth
40% of 15 decks +5% synergy
Kodama's Reach
33% of 15 decks +2% synergy
Three Visits
27% of 15 decks +2% synergy
Nature's Lore
27% of 15 decks -5% synergy
Farseek
27% of 15 decks -8% synergy
Rite of Replication
20% of 15 decks +17% synergy
Bala Ged Recovery
20% of 15 decks +11% synergy
Utility Artifacts
Conjurer's Closet
40% of 15 decks +38% synergy
Crystal Shard
27% of 15 decks +26% synergy
Enchantments
Wilderness Reclamation
20% of 15 decks +16% synergy
Guardian Project
20% of 15 decks +11% synergy
Mystic Remora
20% of 15 decks +2% synergy
Rhystic Study
20% of 15 decks -8% synergy
Utility Lands
Reliquary Tower
47% of 15 decks +17% synergy
Alchemist's Refuge
40% of 15 decks +33% synergy
Temple of the False God
40% of 15 decks +30% synergy
Boseiju, Who Endures
31% of 13 decks +11% synergy
Mystic Sanctuary
27% of 15 decks +15% synergy
Otawara, Soaring City
23% of 13 decks +6% synergy
Mana Artifacts
Sol Ring
80% of 15 decks -4% synergy
Arcane Signet
47% of 15 decks -26% synergy
Azorius Signet
44% of 9 decks +19% synergy
Selesnya Signet
33% of 9 decks +25% synergy
Simic Signet
27% of 15 decks +12% synergy
Coveted Jewel
20% of 15 decks +19% synergy
Lands
Command Tower
80% of 15 decks +6% synergy
Hinterland Harbor
67% of 15 decks +39% synergy
Breeding Pool
60% of 15 decks +19% synergy
Misty Rainforest
47% of 15 decks +35% synergy
Selesnya Sanctuary
44% of 9 decks +30% synergy
Azorius Chancery
44% of 9 decks +30% synergy
Rejuvenating Springs
40% of 15 decks +11% synergy
Dreamroot Cascade
38% of 13 decks +20% synergy
Simic Growth Chamber
33% of 15 decks +14% synergy
Sunpetal Grove
33% of 9 decks +10% synergy
Bountiful Promenade
33% of 9 decks +9% synergy
Seaside Citadel
33% of 9 decks +7% synergy
Yavimaya Coast
33% of 15 decks +7% synergy
Exotic Orchard
33% of 15 decks -2% synergy
Temple Garden
33% of 9 decks -7% synergy
Hallowed Fountain
33% of 9 decks -7% synergy
Simic Guildgate
27% of 15 decks +20% synergy
Vineglimmer Snarl
27% of 15 decks +16% synergy
Flooded Grove
27% of 15 decks +14% synergy
Temple of Mystery
27% of 15 decks +9% synergy
Fabled Passage
20% of 15 decks +11% synergy
Flooded Strand
20% of 15 decks +9% synergy
Tropical Island
20% of 15 decks +6% synergy
Terramorphic Expanse
20% of 15 decks +4% synergy
Evolving Wilds
20% of 15 decks -1% synergy