Gwenna, Eyes of Gaea, Umbral Mantle, and Leyline of Abundance

Prerequisites

• Gwenna, Eyes of Gaea on the battlefield
• Umbral Mantle on the battlefield
• Leyline of Abundance on the battlefield
• Umbral Mantle attached to Gwenna
• Gwenna does not have summoning sickness

Steps

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or activate abilities of creatures
2. Leyline of Abundance triggers, adding
3. Activate Gwenna by paying and untapping it, giving itself +2/+2 until end of turn
4. Repeat

Results

• Infinitely large Gwenna until end of turn