Voltaic Construct, Axebane Guardian, and Ygra, Eater of All

Prerequisites

• Voltaic Construct on the battlefield
• Axebane Guardian on the battlefield
• Ygra, Eater of All on the battlefield

Steps

1. Activate Axebane Guardian by tapping it, adding at least three mana of any color Activate Voltaic Construct by paying , untapping Axebane Guardian
2. Repeat

Results

• Infinite colored mana
• Infinite untap of artifact creatures you control