Urza, Prince of Kroog | Reset | Liquimetal Torque

(and one other card)

It is an opponent's turn.
Lands you control can tap to produce at least ({6} magic symbol) ({U} magic symbol) ({U} magic symbol) .

During an opponent's turn, after their upkeep step, activate
Liquimetal Torque's second ability by tapping it, causing
Mnemonic Wall to become an artifact until end of turn.
Activate all mana-producing lands you control by tapping them, adding at least ({6} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Cast
Reset by paying ({U} magic symbol) ({U} magic symbol) , untapping all lands you control.
Activate
Urza by paying ({6} magic symbol) , 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 from step 2.
If lands you control can tap to proudce at least ({7} magic symbol) ({U} magic symbol) ({U} magic symbol) , this combo nets infinite mana, which can be used to activate
Urza's ability infinitely and/or cast
Reset choosing its other modes.