Selvala, Eager Trailblazer, and Umbral Mantle

Prerequisites

• Selvala, Eager Trailblazer on the battlefield
• Umbral Mantle on the battlefield
• You control at least four creatures with different powers
• Umbral Mantle attached to Selvala
• Selvala does not have summoning sickness

Steps

1. Activate Selvala by tapping it, adding at least four rmana of any color
2. Activate Selvala by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana
• Infinitely large Selvala until end of turn