Dreamstone Hedron, Voltaic Construct, and Sydri, Galvanic Genius

Prerequisites

• Dreamstone Hedron on the battlefield
• Voltaic Construct on the battlefield
• Sydri, Galvanic Genius on the battlefield
• undefined available

Steps

1. Activate Sydri by paying , causing Dreamstone Hedron to become an artifact creature until end of turn
2. Activate Dreamstone Hedron by tapping it, adding
3. Activate Voltaic Construct by paying , untapping Dreamstone Hedron
4. Repeat from step 2

Results

• Infinite colorless mana