Isochron Scepter + Energy Arc + Karn, Silver Golem

Prerequisites

• You control creatures that can tap to produce at least .

Steps

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

Effects

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