Lands you control can tap to produce at least ({8} magic symbol) .
Steps
During an opponent's turn, after their upkeep step, activate all mana-producing lands you control by tapping them, adding at least ({8} magic symbol) .
Cast Reset by paying ({2} 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.
If lands you control can tap to proudce at least ({9} 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.
Results
Infinite colored mana.
Infinite creature copies of artifacts you control.