Carth the Lion + Karn, the Great Creator + Ugin's Nexus + The Chain Veil + Krark-Clan Ironworks

Carth the Lion
Karn, the Great Creator
Ugin's Nexus
The Chain Veil
Krark-Clan Ironworks

Requires
Carth the Lion must be on the battlefield. Karn, the Great Creator must be on the battlefield. Ugin's Nexus must be on the battlefield. The Chain Veil must be on the battlefield. Krark-Clan Ironworks must be on the battlefield. 5 available on all odd-numbered extra turns, with 7 available on all even-numbered extra turns. Mana needed: 2 on your first turn
Steps
  1. Activate Krark-Clan Ironworks by exiling Ugin's Nexus, adding .
  2. Ugin's Nexus triggers, causing you to take an extra turn after this one.
  3. Activate Karn's first loyalty ability by putting two loyalty counters on it, causing any artifact to become an artifact creature until end of turn.
  4. Activate The Chain Veil by paying 4 and tapping it, allowing you to activate all planeswalker abilities an extra time this turn.
  5. Activate Karn's second loyalty ability by removing a loyalty counter from it, returning Ugin's Nexus from exile to your hand.
  6. Move to your next turn.
  7. Cast Ugin's Nexus by paying 5.
  8. Activate Krark-Clan Ironworks by exiling Ugin's Nexus, adding .
  9. Ugin's Nexus triggers, causing you to take an extra turn after this one.
  10. Activate Karn's second loyalty ability by removing a loyalty counter from it, returning Ugin's Nexus from exile to your hand.
  11. Move to your next turn.
  12. Cast Ugin's Nexus by paying 5.
  13. Repeat.
Results
Infinite turns.

Doran, the Siege Tower
0.02% of 4802 decks 1 decks
Esika, God of the Tree
0.01% of 17165 decks 1 decks
Creatures
Wormfang Manta
100% of 1 decks +100% synergy
Satoru Umezawa
100% of 1 decks +100% synergy
Walking Ballista
100% of 2 decks +97% synergy
Displacer Kitten
100% of 1 decks +97% synergy
Angelic Protector
50% of 2 decks +50% synergy
Wall of Spears
50% of 2 decks +50% synergy
Wall of Shields
50% of 2 decks +50% synergy
Wall of Wood
50% of 2 decks +50% synergy
Task Force
50% of 2 decks +50% synergy
Wall of Souls
50% of 2 decks +50% synergy
Wakestone Gargoyle
50% of 2 decks +50% synergy
Peacekeeper
50% of 2 decks +50% synergy
Avacyn, Guardian Angel
50% of 2 decks +50% synergy
Belbe, Corrupted Observer
50% of 2 decks +50% synergy
Phage the Untouchable
50% of 2 decks +50% synergy
Steel Wall
50% of 2 decks +50% synergy
Wall of Mulch
50% of 2 decks +50% synergy
Wall of Shards
50% of 2 decks +50% synergy
Hushwing Gryff
50% of 2 decks +50% synergy
Wall of Tanglecord
50% of 2 decks +50% synergy
Tree of Redemption
50% of 2 decks +50% synergy
Stronghold Rats
50% of 2 decks +50% synergy
Ancestral Statue
50% of 2 decks +50% synergy
Wall of Junk
50% of 2 decks +50% synergy
Woodland Bellower
50% of 2 decks +50% synergy
Academy Rector
50% of 2 decks +50% synergy
Eternal Scourge
50% of 2 decks +50% synergy
Axebane Guardian
50% of 2 decks +50% synergy
Tree of Perdition
50% of 2 decks +50% synergy
Overgrown Battlement
50% of 2 decks +50% synergy
Triskelion
50% of 2 decks +50% synergy
Prowling Serpopard
50% of 2 decks +49% synergy
Genesis Hydra
50% of 2 decks +49% synergy
Quirion Ranger
50% of 2 decks +49% synergy
Verdant Sun's Avatar
50% of 2 decks +49% synergy
Felidar Guardian
50% of 2 decks +49% synergy
Ashaya, Soul of the Wild
50% of 2 decks +49% synergy
Steel Overseer
50% of 2 decks +48% synergy
Ulamog, the Infinite Gyre
50% of 2 decks +48% synergy
Avenger of Zendikar
50% of 2 decks +45% synergy
Instants
Devious Cover-Up
100% of 1 decks +100% synergy
Fading Hope
100% of 1 decks +100% synergy
Fury Storm
100% of 1 decks +100% synergy
Whirlwind Denial
100% of 1 decks +100% synergy
Miscast
100% of 1 decks +99% synergy
Izzet Charm
100% of 1 decks +99% synergy
Void Rend
100% of 1 decks +98% synergy
Abrade
100% of 1 decks +94% synergy
Mystical Tutor
100% of 1 decks +93% synergy
Counterspell
100% of 1 decks +79% synergy
Virulent Swipe
50% of 2 decks +50% synergy
Solidarity
50% of 2 decks +50% synergy
Tower Defense
50% of 2 decks +50% synergy
Assassin's Trophy
50% of 2 decks +44% synergy
Worldly Tutor
50% of 2 decks +43% synergy
Enlightened Tutor
50% of 2 decks +42% synergy
Teferi's Protection
50% of 2 decks +41% synergy
Vampiric Tutor
50% of 2 decks +41% synergy
Heroic Intervention
50% of 2 decks +36% synergy
Sorceries
Vanquish the Horde
100% of 1 decks +98% synergy
Supreme Verdict
100% of 1 decks +97% synergy
Call the Gatewatch
50% of 2 decks +50% synergy
Doomsday
50% of 2 decks +50% synergy
Planewide Celebration
50% of 2 decks +50% synergy
Doomskar
50% of 2 decks +49% synergy
Chain of Smog
50% of 2 decks +49% synergy
Slaughter the Strong
50% of 2 decks +49% synergy
Soul's Majesty
50% of 2 decks +49% synergy
Traverse the Outlands
50% of 2 decks +49% synergy
Harmonize
50% of 2 decks +46% synergy
Rishkar's Expertise
50% of 2 decks +45% synergy
Demonic Tutor
50% of 2 decks +38% synergy
Utility Artifacts
Sylvok Lifestaff
50% of 2 decks +50% synergy
Orochi Hatchery
50% of 2 decks +50% synergy
Magistrate's Scepter
50% of 2 decks +50% synergy
Knowledge Pool
50% of 2 decks +50% synergy
Staff of Nin
50% of 2 decks +49% synergy
Meekstone
50% of 2 decks +49% synergy
God-Pharaoh's Statue
50% of 2 decks +49% synergy
Mycosynth Lattice
50% of 2 decks +49% synergy
Bow of Nylea
50% of 2 decks +49% synergy
Dowsing Dagger
50% of 2 decks +49% synergy
Teferi's Puzzle Box
50% of 2 decks +49% synergy
Lifecrafter's Bestiary
50% of 2 decks +48% synergy
Thousand-Year Elixir
50% of 2 decks +48% synergy
The Great Henge
50% of 2 decks +45% synergy
Lightning Greaves
50% of 2 decks +25% synergy
Swiftfoot Boots
50% of 2 decks +22% synergy
Enchantments
Hive Mind
100% of 1 decks +100% synergy
Possibility Storm
100% of 1 decks +100% synergy
Oath of Teferi
100% of 1 decks +99% synergy
Behind the Scenes
50% of 2 decks +50% synergy
Oath of Nissa
50% of 2 decks +50% synergy
Canopy Cover
50% of 2 decks +49% synergy
Assault Formation
50% of 2 decks +49% synergy
Food Chain
50% of 2 decks +49% synergy
Brave the Sands
50% of 2 decks +49% synergy
The Eldest Reborn
50% of 2 decks +49% synergy
Sphere of Safety
50% of 2 decks +48% synergy
Elemental Bond
50% of 2 decks +47% synergy
Mirari's Wake
50% of 2 decks +47% synergy
Guardian Project
50% of 2 decks +46% synergy
Planeswalkers
Saheeli Rai
100% of 1 decks +100% synergy
Tamiyo, Collector of Tales
100% of 1 decks +100% synergy
Venser, the Sojourner
100% of 1 decks +100% synergy
Ral, Storm Conduit
100% of 1 decks +99% synergy
Ashiok, Dream Render
100% of 1 decks +99% synergy
Teferi, Time Raveler
100% of 1 decks +99% synergy
Narset, Parter of Veils
100% of 1 decks +97% synergy
Vraska, Swarm's Eminence
50% of 2 decks +50% synergy
Gideon of the Trials
50% of 2 decks +50% synergy
Garruk Wildspeaker
50% of 2 decks +50% synergy
Professor Onyx
50% of 2 decks +49% synergy
Garruk, Primal Hunter
50% of 2 decks +49% synergy
Ugin, the Ineffable
50% of 2 decks +48% synergy
Utility Lands
Teferi's Isle
100% of 1 decks +100% synergy
Havenwood Battleground
50% of 2 decks +50% synergy
Winding Canyons
50% of 2 decks +50% synergy
Stirring Wildwood
50% of 2 decks +50% synergy
Deserted Temple
50% of 2 decks +49% synergy
Llanowar Reborn
50% of 2 decks +49% synergy
Westvale Abbey
50% of 2 decks +49% synergy
Tranquil Thicket
50% of 2 decks +48% synergy
Oran-Rief, the Vastwood
50% of 2 decks +48% synergy
Castle Garenbrig
50% of 2 decks +48% synergy
Strip Mine
50% of 2 decks +47% synergy
Mosswort Bridge
50% of 2 decks +45% synergy
Karn's Bastion
50% of 2 decks +45% synergy
Temple of the False God
50% of 2 decks +40% synergy
Rogue's Passage
50% of 2 decks +31% synergy
Reliquary Tower
50% of 2 decks +21% synergy
Mana Artifacts
Arcane Signet
100% of 2 decks +28% synergy
Sol Ring
100% of 2 decks +15% synergy
Mox Amber
50% of 2 decks +46% synergy
Chromatic Lantern
50% of 2 decks +40% synergy
Lands
Hengegate Pathway
100% of 1 decks +98% synergy
Cragcrown Pathway
100% of 1 decks +98% synergy
Barkchannel Pathway
100% of 1 decks +98% synergy
Needleverge Pathway
100% of 1 decks +98% synergy
Riverglide Pathway
100% of 1 decks +98% synergy
Blightstep Pathway
100% of 1 decks +98% synergy
Clearwater Pathway
100% of 1 decks +97% synergy
Raugrin Triome
100% of 1 decks +97% synergy
Zagoth Triome
100% of 1 decks +97% synergy
Spectator Seating
100% of 1 decks +94% synergy
Sea of Clouds
100% of 1 decks +94% synergy
Rejuvenating Springs
100% of 1 decks +94% synergy
Morphic Pool
100% of 1 decks +93% synergy
Command Tower
100% of 2 decks +26% synergy
Scattered Groves
50% of 2 decks +48% synergy
Branchloft Pathway
50% of 2 decks +48% synergy
Darkbore Pathway
50% of 2 decks +48% synergy
Brightclimb Pathway
50% of 2 decks +48% synergy
Opal Palace
50% of 2 decks +47% synergy
Indatha Triome
50% of 2 decks +47% synergy
Temple of Malady
50% of 2 decks +47% synergy
Temple of Silence
50% of 2 decks +46% synergy
Unclaimed Territory
50% of 2 decks +45% synergy
Bountiful Promenade
50% of 2 decks +45% synergy
Reflecting Pool
50% of 2 decks +45% synergy
Undergrowth Stadium
50% of 2 decks +44% synergy
Prismatic Vista
50% of 2 decks +44% synergy
Vault of Champions
50% of 2 decks +44% synergy
Canopy Vista
50% of 2 decks +42% synergy
Temple Garden
50% of 2 decks +41% synergy
Overgrown Tomb
50% of 2 decks +41% synergy
Bloodstained Mire
50% of 2 decks +40% synergy
Windswept Heath
50% of 2 decks +40% synergy
Marsh Flats
50% of 2 decks +39% synergy
Misty Rainforest
50% of 2 decks +38% synergy