Isochron Scepter, Vitalize, and Karn's Touch

Prerequisites

• Isochron Scepter on the battlefield
• Vitalize in exile
• Karn's Touch in hand
• You control creatures that can tap to produce at least
• available

Steps

1. Cast Karn's Touch by paying , targeting Isochron Scepter, causing it to become an artifact creature until end of turn
2. Activate creatures you control by tapping those, adding
3. Activate Isochron Scepter by paying and tapping it, casting a copy of Vitalize without paying its mana cost, untapping all creatures
4. Repeat from step 2

Results

• Infinite mana creatures you control can produce
• Infinite storm count