Isochron Scepter, Energy Arc, and Sydri, Galvanic Genius

Prerequisites

• Isochron Scepter on the battlefield
• Energy Arc in exile
• Sydri, Galvanic Genius on the battlefield
• undefined available

Steps

1. Activate Sydri's first ability by paying , causing Isochron Scepter 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 Energy Arc without paying its mana cost, untapping all creatures
4. Repeat from step 2

Results

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