Gwenna, Eyes of Gaea, Umbral Mantle, and Mana Reflection

Prerequisites

• Gwenna, Eyes of Gaea on the battlefield
• Umbral Mantle on the battlefield
• Mana Reflection on the battlefield

Steps

1. Activate Gwenna by tapping it, adding four mana of any color(s) that can only be spent to cast creature spells or activate abilities of creatures
2. Activate Gwenna by paying and untapping it, giving itself +2/+2 until end of turn
3. Repeat

Results

• Infinite colored mana that can only be spent to activate abilities of creatures
• Infinite colored mana that can only be spent to cast creature spells
• Infinitely large Gwenna until end of turn