Trazyn the Infinite, Umbral Mantle, and Prismatic Geoscope

Prerequisites

• Trazyn the Infinite on the battlefield
• Umbral Mantle on the battlefield
• Prismatic Geoscope in the graveyard

Steps

1. Activate Trazyn using Prismatic Geoscope's ability by tapping it, adding at least three mana of any color(s)
2. Activate Trazyn by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce
• Infinitely large creature until end of turn