Activate Emry by tapping it, allowing you to cast Shifting Wall from your graveyard this turn.
Cast Shifting Wall by paying {0}.
Shifting Wall enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite storm count

Emry, Lurker of the Loch

Dross Scorpion

Mycosynth Lattice

Shifting Wall

During an opponent's turn, after their upkeep step, activate all mana-producing lands you control by tapping them, adding at least {8}.
Cast Reset by paying {2}, untapping all lands you control.
Activate Urza by paying {6}, creating a token copy of Mnemonic Wall that is a 1/1 Soldier in addition to its other types.
When the Mnemonic Wall token enters the battlefield, it triggers, returning Reset to your hand from your graveyard.
Repeat.
If lands you control can tap to proudce at least {9}, this combo nets infinite mana, which can be used to activate Urza's ability infinitely and/or cast Reset choosing its other modes.

Infinite colored mana

Infinite creature copies of artifacts you control

Infinite creature tokens

Infinite magecraft triggers

Infinite mana permanents you control can produce

Urza, Prince of Kroog

Reset

Mnemonic Wall

Activate all mana-producing lands you control by tapping them, adding at least {10}.
Cast Turnabout by paying {4}, untapping all lands you control.
Activate Urza by paying {6}, creating a token copy of Mnemonic Wall that is a 1/1 Soldier in addition to its other types.
When the Mnemonic Wall token enters the battlefield, it triggers, returning Turnabout to your hand from your graveyard.
Repeat.
If lands you control can tap to proudce at least {11}, this combo nets infinite mana, which can be used to activate Urza's ability infinitely and/or cast Turnabout choosing its other modes.

Turnabout

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