Scuttling Sliver, Trazyn the Infinite, Prismatic Geoscope, and Amorphous Axe

Prerequisites

• Scuttling Sliver on the battlefield
• Trazyn the Infinite on the battlefield
• Prismatic Geoscope in the graveyard
• Amorphous Axe on the battlefield

Steps

1. Activate Trazyn using Prismatic Geoscope's ability by tapping it, adding at least three mana of any color
2. Activate Trazyn by paying , untapping it
3. Repeat

Results

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