Goblin Welder + Retreat to Coralhelm + Darksteel Citadel + Ancient Den

Goblin Welder
Retreat to Coralhelm
Darksteel Citadel
Ancient Den

Requires
Goblin Welder must be on the battlefield. Retreat to Coralhelm must be on the battlefield. Darksteel Citadel must be in the graveyard. Ancient Den must be on the battlefield. Goblin Welder does not have summoning sickness.
Steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Ancient Den and return Darksteel Citadel from your graveyard to the battlefield.
  2. Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Darksteel Citadel by tapping it, adding .
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Ancient Den from your graveyard to the battlefield.
  5. Ancient Den enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Ancient Den by tapping it, adding .
  7. Repeat.
Results
Infinite colorless mana. Infinite landfall triggers. Infinite white mana.

Ishai, Ojutai Dragonspeaker // Toggo, Goblin Weaponsmith
11.43% of 35 decks 4 decks
Breya, Etherium Shaper
0.02% of 13938 decks 3 decks
Dr. Madison Li
0.05% of 4216 decks 2 decks
Liberty Prime, Recharged
0.03% of 3060 decks 1 decks
Bjorna, Nightfall Alchemist // Sophina, Spearsage Deserter
0.62% of 162 decks 1 decks
High Synergy Cards
Great Furnace
100% of 11 decks +94% synergy
Seat of the Synod
100% of 11 decks +94% synergy
Foundry Inspector
55% of 11 decks +50% synergy
Reckless Fireweaver
55% of 11 decks +50% synergy
Etherium Sculptor
55% of 11 decks +49% synergy
Ruin Ghost
45% of 11 decks +45% synergy
Esper Sentinel
64% of 11 decks +43% synergy
Treasure Vault
45% of 11 decks +43% synergy
Goblin Engineer
45% of 11 decks +42% synergy
Dispatch
45% of 11 decks +41% synergy
Top Cards
An Offer You Can't Refuse
50% of 10 decks +29% synergy
Wayfarer's Bauble
45% of 11 decks +35% synergy
Cyclonic Rift
45% of 11 decks +18% synergy
Swords to Plowshares
45% of 11 decks -17% synergy
Walking Atlas
36% of 11 decks +36% synergy
Dreamscape Artist
36% of 11 decks +36% synergy
Retreat to Emeria
36% of 11 decks +36% synergy
Krark-Clan Ironworks
36% of 11 decks +35% synergy
Unwinding Clock
36% of 11 decks +34% synergy
Urza, Lord High Artificer
36% of 11 decks +33% synergy
Creatures
Puresteel Paladin
36% of 11 decks +33% synergy
Imperial Recruiter
36% of 11 decks +30% synergy
Jhoira, Weatherlight Captain
36% of 11 decks +30% synergy
Solemn Simulacrum
36% of 11 decks +22% synergy
Electrostatic Pummeler
27% of 11 decks +27% synergy
Aethergeode Miner
27% of 11 decks +27% synergy
Trove Warden
27% of 11 decks +27% synergy
Quicksmith Genius
27% of 11 decks +27% synergy
Myr Retriever
27% of 11 decks +25% synergy
Shimmer Dragon
27% of 11 decks +25% synergy
Kappa Cannoneer
27% of 11 decks +25% synergy
Teshar, Ancestor's Apostle
27% of 11 decks +25% synergy
Thought Monitor
27% of 11 decks +24% synergy
Sai, Master Thopterist
27% of 11 decks +24% synergy
Enthusiastic Mechanaut
27% of 11 decks +23% synergy
Burnished Hart
27% of 11 decks +23% synergy
Phyrexian Metamorph
27% of 11 decks +20% synergy
Instants
Enlightened Tutor
36% of 11 decks +19% synergy
Muddle the Mixture
27% of 11 decks +22% synergy
Mana Drain
27% of 11 decks +12% synergy
Path to Exile
27% of 11 decks -19% synergy
Sorceries
Sevinne's Reclamation
27% of 11 decks +20% synergy
Utility Artifacts
Panharmonicon
36% of 11 decks +32% synergy
Decoction Module
27% of 11 decks +27% synergy
Gonti's Aether Heart
27% of 11 decks +27% synergy
Amulet of Vigor
27% of 11 decks +26% synergy
Mishra's Bauble
27% of 11 decks +26% synergy
Cloud Key
27% of 11 decks +25% synergy
Sculpting Steel
27% of 11 decks +25% synergy
Crucible of Worlds
27% of 11 decks +25% synergy
Archaeomancer's Map
27% of 11 decks +23% synergy
Enchantments
Felidar Retreat
36% of 11 decks +29% synergy
Rhystic Study
36% of 11 decks +9% synergy
Valakut Exploration
27% of 11 decks +25% synergy
Storm the Vault
27% of 11 decks +24% synergy
Utility Lands
Vault of Whispers
100% of 3 decks +96% synergy
Fomori Vault
75% of 4 decks +73% synergy
Inventors' Fair
36% of 11 decks +33% synergy
Oboro, Palace in the Clouds
27% of 11 decks +27% synergy
Buried Ruin
27% of 11 decks +22% synergy
Urza's Saga
27% of 11 decks +20% synergy
Reliquary Tower
27% of 11 decks -2% synergy
Mana Artifacts
Sol Ring
100% of 11 decks +16% synergy
Arcane Signet
91% of 11 decks +19% synergy
Boros Signet
36% of 11 decks +13% synergy
Azorius Signet
36% of 11 decks +10% synergy
Izzet Signet
36% of 11 decks +8% synergy
Mana Vault
27% of 11 decks +21% synergy
Talisman of Progress
27% of 11 decks +4% synergy
Talisman of Creativity
27% of 11 decks -2% synergy
Lands
Razortide Bridge
73% of 11 decks +66% synergy
Command Tower
73% of 11 decks -1% synergy
Rustvale Bridge
64% of 11 decks +58% synergy
Flooded Strand
64% of 11 decks +53% synergy
Scalding Tarn
64% of 11 decks +53% synergy
Arid Mesa
55% of 11 decks +44% synergy
Steam Vents
55% of 11 decks +16% synergy
Hallowed Fountain
55% of 11 decks +14% synergy
Silverbluff Bridge
45% of 11 decks +39% synergy
Sacred Foundry
45% of 11 decks +9% synergy
Spire of Industry
36% of 11 decks +33% synergy
Aether Hub
27% of 11 decks +27% synergy
Power Depot
27% of 11 decks +27% synergy
Azorius Chancery
27% of 11 decks +12% synergy
Boros Garrison
27% of 11 decks +12% synergy
Terramorphic Expanse
27% of 11 decks +12% synergy
Izzet Boilerworks
27% of 11 decks +11% synergy
Evolving Wilds
27% of 11 decks +6% synergy
Glacial Fortress
27% of 11 decks +2% synergy
Training Center
27% of 11 decks -0% synergy
Clifftop Retreat
27% of 11 decks -1% synergy
Sulfur Falls
27% of 11 decks -3% synergy