Myr Welder, Pemmin's Aura, and Prismatic Geoscope

Prerequisites

• Myr Welder on the battlefield
• Pemmin's Aura on the battlefield
• Prismatic Geoscope in exile
• Pemmin's Aura attached to Myr Welder
• Myr Welder does not have summoning sickness
• Lands you control have at least two basic land types

Steps

1. Activate Myr Welder using Prismatic Geoscope's ability by tapping it, adding at least
2. Activate Pemmin's Aura's first ability by paying , untapping Myr Welder
3. Repeat

Results

• Infinite colored mana