Kinnan, Bonder Prodigy, Gwenna, Eyes of Gaea, and Umbral Mantle

Prerequisites

• Kinnan, Bonder Prodigy on the battlefield
• Gwenna, Eyes of Gaea on the battlefield
• Umbral Mantle 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. Kinnan 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