Myr Welder, Staff of Domination, and Prismatic Geoscope

Prerequisites

• Myr Welder on the battlefield
• Staff of Domination on the battlefield or in exile
• Prismatic Geoscope in exile

Steps

1. Activate Myr Welder using Prismatic Geoscope's ability by tapping it, adding at least
2. If Staff of Domination is exiled, activate Myr Welder using Staff of Domination's first ability by paying , untapping it
3. Otherwise, activate Staff of Domination's third ability by paying and tapping it, untapping Myr Welder
4. Then, activate Staff of Domination's first ability by paying , untapping it
5. Repeat

Results

• Infinite card draw
• Infinite colored mana
• Infinite draw triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control