Dramatic Reversal + Isochron Scepter

Dramatic Reversal
Isochron Scepter

Requires
Isochron Scepter on the battlefield. Dramatic Reversal exiled by Isochron Scepter. Nonland permanents you control can tap to produce at least 3.
Steps
  1. Activate all mana-producing nonland permanents you control by tapping them, adding at least 3
  2. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Dramatic Reversal without paying it's mana cost
  3. Resolve Dramatic Reversal, untapping all nonland permanents you control
  4. Repeat
Results
Infinite mana nonland permanents you control can produce. Infinite storm count. Infinite magecraft triggers. Infinite untap of nonland permanents you control.