Isochron Scepter, Xenic Poltergeist, and Energy Arc

Prerequisites

• Isochron Scepter on the battlefield
• Xenic Poltergeist on the battlefield
• Energy Arc in exile

Steps

1. Animate Isochron Scepter using Xenic Poltergeist
2. Activate any number of creatures by tapping them, adding at least
3. Activate Isochron Scepter by paying and tapping it, casting a copy of Energy Arc without paying its mana cost
4. Resolve Energy Arc, untapping all creatures you control Repeat from step 2

Results

• Infinite magecraft triggers
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinite storm count