Primal Wellspring triggers, copying Narset's Reversal targeting the original Narset's Reversal.
Resolve the copy of Narset's Reversal, copying the original Narset's Reversal targeting Dramatic Reversal, and returning the original Narset's Reversal to your hand.
Resolve Narset's Reversal, copying Dramatic Reversal and returning the original Dramatic Reversal to your hand.
Resolve the copy of Dramatic Reversal, untapping all nonland permanents you control.
Repeat.
If nonland permanents you control can tap to produce at least ({1} magic symbol) ({U} magic symbol) , this combo nets infinite mana.
Results
Infinite magecraft triggers.
Infinite mana nonland permanents you control can produce.