Umbral Mantle, and Overgrown Battlement

Prerequisites

• Umbral Mantle on the battlefield
• Overgrown Battlement on the battlefield
• undefined

Steps

1. Activate Overgrown Battlement by tapping it, adding at least three mana of any color
2. Activate Overgrown Battlement by paying and untapping it, giving it +2/+2 until end of turn
3. Repeat

Results

• Infinite power for a creature until end of turn
• Infinite green mana