Activate the basic land with Fertile Ground attached by tapping it, adding at least {1}.
Fertile Ground triggers, adding {U}.
Activate Earthcraft by tapping Horseshoe Crab, untapping the basic land.
Activate Horseshoe Crab by paying {U}, untapping it.
Repeat.
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.

Infinite colored mana

Infinite untap of basic lands you control

Earthcraft

Fertile Ground

Horseshoe Crab

Activate the basic land with Fertile Ground attached by tapping it, adding at least {1}.
Fertile Ground triggers, adding {U}.
Activate Earthcraft by tapping Simic Ragworm, untapping the basic land.
Activate Simic Ragworm by paying {U}, untapping it.
Repeat.
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.

Simic Ragworm

Activate the basic land with Fertile Ground attached by tapping it, adding at least {1}.
Fertile Ground triggers, adding {U}.
Activate Earthcraft by tapping Morphling, untapping the basic land.
Activate Morphling's first ability by paying {U}, untapping it.
Repeat.
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.

Morphling

Activate the basic land with Fertile Ground attached by tapping it, adding at least {1}.
Fertile Ground triggers, adding {U}.
Activate Earthcraft by tapping Soliton, untapping the basic land.
Activate Soliton by paying {U}, untapping it.
Repeat.
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.

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