Voltaic Construct, Bloom Tender, and Ashnod's Transmogrant

Prerequisites

• Voltaic Construct on the battlefield
• Bloom Tender on the battlefield
• Ashnod's Transmogrant on the battlefield

Steps

1. Cause Bloom Tender to become an artifact using Ashnod's Transmogrant
2. Activate Bloom Tender by tapping it, adding at least Activate Voltaic Construct by paying , untapping Bloom Tender
3. Repeat from step 2

Results

• Infinite mana of colors among permanents you control
• Infinite untap of artifact creatures you control