Cast Dramatic Reversal by paying {1}{U}.
In response, activate Sigil Tracer by paying {1}{U} and tapping two untapped Wizards, copying Dramatic Reversal.
Let the copy resolve, untapping all nonland permanents you control.
Activate nonland permanents you control by tapping them, adding at least {1}{U}.
Repeat from step 2.

Infinite mana nonland permanents you control can produce

Infinite untap of nonland permanents

Sigil Tracer

Dramatic Reversal

Cast Reins of Power by paying {2}{U}{U}.
Holding priority, activate all mana-producing creatures you control by tapping them, adding at least {2}{U}{U}.
Activate Sigil Tracer twice by paying {2}{U}{U}, tapping it and three other Wizards you control, copying Reins of Power twice.
Resolve the first copy of Reins of Power, untapping all creatures you and target opponent control, and exchanging control of those creatures.
Resolve the second copy of Reins of Power, untapping all creatures you and target opponent control, and exchanging control of those creatures, causing you to regain control of all the creatures you originally controlled.
Repeat from step 2.
If creatures you control can tap to produce at least {3}{U}{U}, this combo nets infinite mana.

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