Play Lotus Field. When it enters untapped due to Spelunking, 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 Spelunking. 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 Spelunking. Choose to have Echoing Deeps enter as a copy of Lotus Field.
Repeat from step 5.

Infinite colored mana

Infinite mana lands you control can produce

Infinite landfall triggers

Lotus Field

Echoing Deeps

Aftermath Analyst

Shifting Woodland

Spelunking

Activate Deepwood Ghoul by paying 2 life.
Repeat step 1 until Greven has power 21 or greater due to its first ability.
Deal combat damage to an opponent using Greven. The opponent loses the game due to being dealt 21 or more combat damage from your commander.

Target opponent loses the game

Greven, Predator Captain

Deepwood Ghoul

Declare Altaïr as an attacker, triggering its ability, exiling Éomer from your graveyard with a memory counter on it and creating three tapped and attacking copies of Éomer.
Put all but one Éomer token into your graveyard due to the legend rule, causing you to get at least one Éomer trigger, causing you to untap all creatures you control and to get an additional combat phase after this one.
At the end of your combat phase, Altaïr triggers, causing you to exile the Éomer token.
Repeat each combat phase.

Infinite LTB

Infinite ETB

Infinite death triggers

Infinite combat phases

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Altaïr Ibn-La'Ahad

Éomer, Marshal of Rohan

Maskwood Nexus

Ojer Taq, Deepest Foundation // Temple of Civilization

Activate The Blackstaff of Waterdeep by paying {1}{U} and tapping it, causing Maskwood Nexus to become an artifact creature.
Activate any number of mana-producing creatures you control by tapping them, adding at least {3}.
Activate Maskwood Nexus by paying {3} and tapping it, creating a 2/2 Shapeshifter creature token.
When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat from step 2.
If creatures you control can tap to produce at least {4}, this combo nets infinite mana.

Infinite creature tokens

Infinite untap of all creatures

Intruder Alarm

The Blackstaff of Waterdeep

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