Activate Sylvan Safekeeper by sacrificing any land except Shifting Woodland.
Repeat step 1 until you control no other lands except Shifting Woodland.
Activate Shifting Woodland's second ability by paying {2}{G}{G}, causing it to become a copy of Aftermath Analyst until end of turn.
Activate Shifting Woodland by paying {3}{G} and sacrificing it, returning it and all other land cards from your graveyard to the battlefield untapped due to Archelos.
Activate any number of lands by tapping them, adding at least {5}{G}{G}{G}.
Repeat.
Resolve all Sylvan Safekeeper abilities.

Infinite LTB

Infinite sacrifice triggers

Infinite death triggers

Infinite mana lands you control can produce

Infinite landfall triggers

Shifting Woodland

Aftermath Analyst

Sylvan Safekeeper

Archelos, Lagoon Mystic

Play Lotus Field. When it enters untapped due to Archelos, it triggers.
Holding priority, activate Lotus Field by tapping it, adding {G}{G}{G}.
Resolve the Lotus Field trigger, sacrificing it and Echoing Deeps.
Activate Aftermath Analyst by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Archelos. Choose to have Echoing Deeps enter as a copy of Lotus Field.
When Echoing Deeps and Lotus Field enter, they each trigger.
Holding priority, activate Echoing Deeps, Lotus Field and two other mana-producing lands except Shifting Woodland by tapping them, adding at least {5}{G}{G}{G}.
Resolve the Echoing Deeps and Lotus Field triggers, sacrificing them and the lands tapped for mana in step 6.
Activate Shifting Woodland's first ability by tapping it, adding {G}.
Activate Shifting Woodland's second ability by paying {2}{G}{G}, causing it to become a copy of Aftermath Analyst.
Activate Shifting Woodland by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Archelos. Choose to have Echoing Deeps enter as a copy of Lotus Field.
Repeat from step 5.

Infinite colored mana

Lotus Field

Echoing Deeps

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