Time Warp + Call to Mind + Mystic Retrieval + Swarm Intelligence

Time Warp
Call to Mind
Mystic Retrieval
Swarm Intelligence

Requires
Time Warp must be in hand. Call to Mind must be in hand. Mystic Retrieval must be in the graveyard. Swarm Intelligence must be on the battlefield. Mana needed: 3 on each odd-numbered turn, with at most 3 available each even-numbered turn
Steps
  1. Cast Time Warp by paying 3, targeting yourself.
  2. Swarm Intelligence triggers, copying Time Warp, targeting yourself.
  3. Resolve both Time Warps, causing you to take two extra turns after this one.
  4. Move to your next turn.
  5. Cast etiher Mystic Retrieval or Call to Mind by paying its mana cost, targeting either Call to Mind or Mystic Retrieval in your graveyard.
  6. Swarm Intelligence triggers, copying Call to Mind or Mystic Retrieval, targeting Time Warp.
  7. Resolve both Call to Minds or Mystic Retrievals, returning Time Warp and either Call to Mind or Mystic Retrieval from your graveyard to your hand.
  8. Move to your next turn.
  9. Repeat.
Results
Infinite turns. Instant/Sorcery with "Return Instant/Sorcery from GY to hand".

Mizzix of the Izmagnus
0.08% of 4907 decks 4 decks
Narset, Enlightened Master
0.02% of 5802 decks 1 decks
Kess, Dissident Mage
0.01% of 7209 decks 1 decks
Anhelo, the Painter
0.02% of 6192 decks 1 decks
Galazeth Prismari
0.03% of 3795 decks 1 decks
Rowan Kenrith // Will Kenrith
0.11% of 891 decks 1 decks
Melek, Izzet Paragon
0.07% of 1527 decks 1 decks
Keranos, God of Storms
0.11% of 886 decks 1 decks
High Synergy Cards
Mystical Tutor
82% of 11 decks +67% synergy
Time Stretch
64% of 11 decks +62% synergy
Primal Amulet
60% of 10 decks +59% synergy
Beacon of Tomorrows
55% of 11 decks +54% synergy
Epic Experiment
55% of 11 decks +53% synergy
Preordain
64% of 11 decks +53% synergy
Solve the Equation
56% of 9 decks +51% synergy
Dig Through Time
55% of 11 decks +49% synergy
Treasure Cruise
55% of 11 decks +49% synergy
Karn's Temporal Sundering
50% of 10 decks +49% synergy
Top Cards
Cyclonic Rift
73% of 11 decks +45% synergy
Counterspell
64% of 11 decks +21% synergy
Archmage Emeritus
56% of 9 decks +48% synergy
Commander's Sphere
55% of 11 decks +39% synergy
Blue Sun's Zenith
45% of 11 decks +43% synergy
Mizzix's Mastery
45% of 11 decks +42% synergy
Tezzeret's Gambit
45% of 11 decks +42% synergy
Frantic Search
45% of 11 decks +33% synergy
Brainstorm
45% of 11 decks +24% synergy
Twinning Staff
44% of 9 decks +43% synergy
Creatures
Guttersnipe
36% of 11 decks +30% synergy
Storm-Kiln Artist
33% of 9 decks +24% synergy
Talrand, Sky Summoner
27% of 11 decks +23% synergy
Instants
Increasing Vengeance
36% of 11 decks +35% synergy
Counterflux
36% of 11 decks +34% synergy
Mystic Confluence
36% of 11 decks +34% synergy
Fact or Fiction
36% of 11 decks +30% synergy
Lightning Bolt
36% of 11 decks +26% synergy
Nexus of Fate
33% of 9 decks +32% synergy
Electrodominance
33% of 9 decks +32% synergy
Expansion // Explosion
33% of 9 decks +31% synergy
Turnabout
27% of 11 decks +26% synergy
Stroke of Genius
27% of 11 decks +26% synergy
Disallow
27% of 11 decks +25% synergy
Reverberate
27% of 11 decks +24% synergy
Rewind
27% of 11 decks +24% synergy
Pull from Tomorrow
27% of 11 decks +24% synergy
Seething Song
27% of 11 decks +21% synergy
Snap
27% of 11 decks +20% synergy
Pongify
27% of 11 decks +16% synergy
Mana Drain
27% of 11 decks +12% synergy
Chaos Warp
27% of 11 decks -5% synergy
Sorceries
Temporal Mastery
36% of 11 decks +35% synergy
Past in Flames
36% of 11 decks +34% synergy
Ponder
36% of 11 decks +23% synergy
Windfall
36% of 11 decks +23% synergy
Vandalblast
36% of 11 decks +20% synergy
River's Rebuke
30% of 10 decks +29% synergy
Jaya's Immolating Inferno
30% of 10 decks +28% synergy
Inner Fire
27% of 11 decks +27% synergy
Time Spiral
27% of 11 decks +27% synergy
Plea for Power
27% of 11 decks +27% synergy
Baral's Expertise
27% of 11 decks +26% synergy
Blatant Thievery
27% of 11 decks +26% synergy
Temporal Manipulation
27% of 11 decks +26% synergy
Merchant Scroll
27% of 11 decks +26% synergy
Grapeshot
27% of 11 decks +23% synergy
Curse of the Swine
27% of 11 decks +23% synergy
Gitaxian Probe
27% of 11 decks +21% synergy
Gamble
27% of 11 decks +17% synergy
Utility Artifacts
Sphinx-Bone Wand
27% of 11 decks +27% synergy
Aetherflux Reservoir
27% of 11 decks +24% synergy
Lightning Greaves
27% of 11 decks +2% synergy
Enchantments
Thousand-Year Storm
44% of 9 decks +40% synergy
Metallurgic Summonings
36% of 11 decks +35% synergy
Double Vision
33% of 9 decks +31% synergy
Planeswalkers
Chandra, Hope's Beacon
38% of 8 decks +36% synergy
Ral, Storm Conduit
33% of 9 decks +30% synergy
Utility Lands
Reliquary Tower
36% of 11 decks +7% synergy
Desolate Lighthouse
27% of 11 decks +23% synergy
Mana Artifacts
Sol Ring
91% of 11 decks +6% synergy
Arcane Signet
89% of 9 decks +17% synergy
Izzet Signet
73% of 11 decks +44% synergy
Talisman of Creativity
44% of 9 decks +16% synergy
Thran Dynamo
27% of 11 decks +22% synergy
Sky Diamond
27% of 11 decks +22% synergy
Thought Vessel
27% of 11 decks +10% synergy
Fellwar Stone
27% of 11 decks +6% synergy
Lands
Command Tower
73% of 11 decks -1% synergy
Steam Vents
64% of 11 decks +25% synergy
Training Center
56% of 9 decks +28% synergy
Temple of Epiphany
55% of 11 decks +36% synergy
Shivan Reef
55% of 11 decks +28% synergy
Sulfur Falls
55% of 11 decks +24% synergy
Scalding Tarn
45% of 11 decks +34% synergy
Cascade Bluffs
45% of 11 decks +33% synergy
Izzet Boilerworks
45% of 11 decks +29% synergy
Riverglide Pathway
44% of 9 decks +35% synergy
Frostboil Snarl
44% of 9 decks +31% synergy
Flooded Strand
36% of 11 decks +26% synergy
Volcanic Island
36% of 11 decks +23% synergy
Exotic Orchard
36% of 11 decks +1% synergy
Spirebluff Canal
27% of 11 decks +24% synergy
Polluted Delta
27% of 11 decks +16% synergy
Misty Rainforest
27% of 11 decks +16% synergy