Sanctum Weaver, and Umbral Mantle

Prerequisites

• Sanctum Weaver on the battlefield
• Umbral Mantle on the battlefield
• Umbral Mantle attached to Sanctum Weaver
• You control at least three other enchantments
• Sanctum Weaver does not have summoning sickness

Steps

1. Activate Sanctum Weaver by tapping it, adding at least
2. Activate Sanctum Weaver by paying and untapping it, giving itself +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana
• Infinitely large Sanctum Weaver until end of turn