Isochron Scepter, To Arms!, and Xenic Poltergeist

Prerequisites

• Isochron Scepter on the battlefield
• To Arms! in exile
• Xenic Poltergeist on the battlefield
• You control creatures that can tap to produce at least
• Xenic Poltergeist does not have summoning sickness
• available

Steps

1. Activate Xenic Poltergeist's first ability by paying and tapping it, causing Isochron Scepter to become an artifact creature until your next upkeep
2. Activate creatures you control by tapping those, adding
3. Activate Isochron Scepter by paying and tapping it, casting a copy of To Arms! without paying its mana cost, untapping all creatures
4. Repeat from step 2

Results

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