Earthcraft + Fertile Ground + Horseshoe Crab

Earthcraft
Fertile Ground
Horseshoe Crab

Requires
Earthcraft must be on the battlefield. Fertile Ground must be on the battlefield (attached to a basic land you control). Horseshoe Crab must be on the battlefield.
Steps
  1. Activate the basic land with Fertile Ground attached by tapping it, adding at least 1.
  2. Fertile Ground triggers, adding .
  3. Activate Earthcraft by tapping Horseshoe Crab, untapping the basic land.
  4. Activate Horseshoe Crab by paying , untapping it.
  5. Repeat.
  6. If the basic land is an Island, you may add mana of any color using Fertile Ground's trigger, and you may infinitely repeat steps 3-4 with any other basic land you control.
Results
Infinite colored mana. Infinite untap of basic lands you control.

Derevi, Empyrial Tactician
0.04% of 7409 decks 3 decks
Riku of Two Reflections
0.04% of 4895 decks 2 decks
Chulane, Teller of Tales
0.03% of 7344 decks 2 decks
Arixmethes, Slumbering Isle
0.03% of 3636 decks 1 decks
Esika, God of the Tree
0.01% of 17767 decks 1 decks
Kydele, Chosen of Kruphix // Thrasios, Triton Hero
0.27% of 364 decks 1 decks
Nadu, Winged Wisdom
0.02% of 5891 decks 1 decks
High Synergy Cards
Pili-Pala
55% of 11 decks +54% synergy
Morphling
45% of 11 decks +45% synergy
Simic Ragworm
45% of 11 decks +45% synergy
Wild Growth
55% of 11 decks +44% synergy
Freed from the Real
45% of 11 decks +43% synergy
Kinnan, Bonder Prodigy
45% of 11 decks +41% synergy
Kiora's Follower
45% of 11 decks +40% synergy
Utopia Sprawl
45% of 11 decks +38% synergy
Umbral Mantle
36% of 11 decks +35% synergy
Pemmin's Aura
36% of 11 decks +35% synergy
Top Cards
Counterspell
73% of 11 decks +30% synergy
Swords to Plowshares
67% of 6 decks +4% synergy
Rhystic Study
45% of 11 decks +18% synergy
Illusionist's Bracers
36% of 11 decks +35% synergy
Basalt Monolith
36% of 11 decks +34% synergy
Ashaya, Soul of the Wild
36% of 11 decks +33% synergy
Peregrine Drake
36% of 11 decks +33% synergy
Arcane Denial
36% of 11 decks +17% synergy
Birds of Paradise
36% of 11 decks +9% synergy
Nature's Lore
36% of 11 decks +4% synergy
Creatures
Puresight Merrow
50% of 6 decks +50% synergy
Mirrorshell Crab
33% of 9 decks +33% synergy
Wormfang Crab
27% of 11 decks +27% synergy
King Crab
27% of 11 decks +27% synergy
Ancient Crab
27% of 11 decks +27% synergy
Purple-Crystal Crab
27% of 11 decks +27% synergy
Knacksaw Clique
27% of 11 decks +27% synergy
Argothian Elder
27% of 11 decks +27% synergy
Chromeshell Crab
27% of 11 decks +27% synergy
Grand Architect
27% of 11 decks +27% synergy
Hedron Crab
27% of 11 decks +26% synergy
Deadeye Navigator
27% of 11 decks +25% synergy
Ruin Crab
27% of 11 decks +25% synergy
Murkfiend Liege
27% of 11 decks +23% synergy
Seedborn Muse
27% of 11 decks +19% synergy
Instants
Enlightened Tutor
50% of 6 decks +32% synergy
Stroke of Genius
27% of 11 decks +26% synergy
Brain Freeze
27% of 11 decks +24% synergy
High Tide
27% of 11 decks +23% synergy
Dramatic Reversal
27% of 11 decks +22% synergy
Force of Will
27% of 11 decks +16% synergy
Growth Spiral
27% of 11 decks +5% synergy
Negate
27% of 11 decks +4% synergy
Sorceries
Idyllic Tutor
50% of 6 decks +45% synergy
Three Visits
36% of 11 decks +12% synergy
Rampant Growth
36% of 11 decks +2% synergy
Cultivate
36% of 11 decks -10% synergy
Braingeyser
27% of 11 decks +27% synergy
Utility Artifacts
Viridian Longbow
27% of 11 decks +27% synergy
Rings of Brighthearth
27% of 11 decks +26% synergy
Isochron Scepter
27% of 11 decks +25% synergy
Enchantments
Verdant Haven
27% of 11 decks +27% synergy
Wolfwillow Haven
27% of 11 decks +26% synergy
Squirrel Nest
27% of 11 decks +26% synergy
Overgrowth
27% of 11 decks +26% synergy
Cryptolith Rite
27% of 11 decks +24% synergy
Wilderness Reclamation
27% of 11 decks +23% synergy
Mystic Remora
27% of 11 decks +9% synergy
Utility Lands
Maze of Ith
27% of 11 decks +24% synergy
Strip Mine
27% of 11 decks +24% synergy
Reliquary Tower
27% of 11 decks -2% synergy
Mana Artifacts
Sol Ring
82% of 11 decks -3% synergy
Arcane Signet
55% of 11 decks -17% synergy
Lands
Temple Garden
83% of 6 decks +43% synergy
Spara's Headquarters
80% of 5 decks +48% synergy
Breeding Pool
73% of 11 decks +32% synergy
Command Tower
73% of 11 decks -1% synergy
Selesnya Sanctuary
50% of 6 decks +36% synergy
Azorius Chancery
50% of 6 decks +35% synergy
Bountiful Promenade
50% of 6 decks +26% synergy
Glacial Fortress
50% of 6 decks +25% synergy
Rejuvenating Springs
50% of 10 decks +21% synergy
Hallowed Fountain
50% of 6 decks +9% synergy
Misty Rainforest
36% of 11 decks +25% synergy
Yavimaya Coast
36% of 11 decks +10% synergy
Rimewood Falls
33% of 9 decks +28% synergy
Mana Confluence
27% of 11 decks +20% synergy
Windswept Heath
27% of 11 decks +17% synergy
Flooded Strand
27% of 11 decks +17% synergy
Tropical Island
27% of 11 decks +13% synergy
Simic Growth Chamber
27% of 11 decks +7% synergy
Hinterland Harbor
27% of 11 decks +0% synergy
Exotic Orchard
27% of 11 decks -8% synergy