Myr Welder, Voltaic Construct, and Grim Monolith

Prerequisites

• Myr Welder on the battlefield
• Voltaic Construct in the graveyard
• Grim Monolith in the graveyard
• undefined available

Steps

1. Activate Myr Welder by tapping it, exiling Voltaic Construct from your graveyard
2. Activate Myr Welder using Voltaic Construct's ability by paying , untapping Myr Welder
3. Activate Myr Welder by tapping it, exiling Grim Monolith from your graveyard
4. Activate Myr Welder using Voltaic Construct's ability by paying , untapping Myr Welder
5. Activate Myr Welder using Grim Monolith's first ability by tapping it, adding
6. Repeat from step 4

Results

• Infinite colorless mana