Cast Llanowar Sentinel by paying {2}{G}.
When Llanowar Sentinel enters the battlefield, it triggers.
In response to this trigger, activate Earthcraft by tapping Llanowar Sentinel, untapping a basic Forest you control.
Activate the Forest by tapping it, adding {G}.
Activate Ashnod's Altar by sacrificing Llanowar Sentinel and putting it on the bottom of your library, adding {C}{C}.
Resolve Llanowar Sentinel's trigger, paying {1}{G} and searching your library for a card named Llanowar Sentinel and putting it onto the battlefield.
Repeat from step 2.

Infinite colorless mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Wheel of Sun and Moon

Ashnod's Altar

Earthcraft

Llanowar Sentinel

Cast Llanowar Sentinel by paying {2}{G}.
Llanowar Sentinel enters the battlefield, triggering itself.
Holding priority, activate Earthcraft by tapping Llanowar Sentinel, untapping a basic land.
Activate the basic land by tapping it, adding {1}.
Activate Phyrexian Altar by sacrificing Llanowar Sentinel, adding {G}.
Llanowar Sentinel is put on the bottom of your library instead of your graveyard due to Wheel of Sun and Moon.
Resolve the Llanowar Sentinel trigger from step 2, causing you to pay {1}{G} to search your library for Llanowar Sentinel and put it onto the battlefield.
Repeat from step 2.

Phyrexian Altar

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