Activate all basic lands you control by tapping them, adding at least {6}{G}{G}{G}{G}{G}.
Cast Early Harvest by paying {1}{G}{G}, untapping all basic lands you control.
Activate Shigeki's channel ability by paying {4}{G}{G} and discarding it, returning Early Harvest and Regrowth from your graveyard to your hand.
Cast Regrowth by paying {1}{G}, returning Shigeki to your hand from your graveyard.
Repeat.
If basic lands you control can tap to produce at least {7}{G}{G}{G}{G}{G}, this combo nets infinite mana.

Infinite magecraft triggers

Infinite mana basic lands you control can produce

Infinite self-discard triggers

Infinite storm count

Infinite untap of basic lands you control

Return most cards from your graveyard to your hand

Shigeki, Jukai Visionary

Early Harvest

Regrowth

Activate all mana-producing lands you control by tapping them, adding at least {9}{G}{G}{G}{G}.
Cast Rude Awakening by paying {4}{G}, untapping all lands you control.
Activate Shigeki's channel ability by paying {4}{G}{G} and discarding it, returning Rude Awakening and Regrowth from your graveyard to your hand.
Cast Regrowth by paying {1}{G}, returning Shigeki to your hand from your graveyard.
Repeat.
If lands you control can tap to produce at least {10}{G}{G}{G}{G}, this combo nets infinite mana.

Infinite mana lands you control can produce

Infinite untap of lands you control

Rude Awakening

Activate all lands you control by tapping them, adding at least {7}{G}{G}{G}{U}{U}.
Cast Turnabout by paying {2}{U}{U}, untapping all lands you control.
Activate Shigeki's channel ability by paying {4}{G}{G} and discarding it, returning Turnabout and Regrowth from your graveyard to your hand.
Cast Regrowth by paying {1}{G}, returning Shigeki to your hand from your graveyard.
Repeat.

Turnabout

Activate all basic lands you control by tapping them, adding at least {5}{G}{G}{G}{G}{G}{U}.
Cast Early Harvest by paying {1}{G}{G}, untapping all basic lands you control.
Activate Shigeki's channel ability by paying {4}{G}{G} and discarding it, returning Early Harvest and Auroral Procession from your graveyard to your hand.
Cast Auroral Procession by paying {G}{U}, returning Shigeki to your hand from your graveyard.
Repeat.

Auroral Procession

During an opponent's turn, activate all lands you control by tapping them, adding at least {4}{G}{G}{G}{U}{U}{U}.
Cast Reset by paying {U}{U}, untapping all basic lands you control.
Activate Shigeki's channel ability by paying {4}{G}{G} and discarding it, returning Reset and Auroral Procession from your graveyard to your hand.
Cast Auroral Procession by paying {G}{U}, returning Shigeki to your hand from your graveyard.
Repeat.

Combos with "Shigeki, Jukai Visionary"