Steelswarm Operator, Pemmin's Aura, and Liquimetal Torque

Prerequisites

• Steelswarm Operator on the battlefield
• Pemmin's Aura on the battlefield
• Liquimetal Torque on the battlefield

Steps

1. Activate Liquimetal Torque by tapping it, causing Pemmin's Aura to become an artifact
2. Activate Steelswarm Operator's second ability by tapping it, adding that can only be spent to activate abilities of artifacts
3. Activate Pemmin's Aura by paying , untapping Steelswarm Operator
4. Repeat from step 2

Results

• Infinite blue mana that can only be spent to activate abilities of artifacts
• Infinite blue mana that can only be spent to cast artifact spells