Umbral Mantle, and Sacellum Godspeaker

Prerequisites

• Umbral Mantle on the battlefield
• Sacellum Godspeaker on the battlefield
• undefined

Steps

1. Activate Sacellum Godspeaker by tapping it, adding at least
2. Activate Sacellum Godspeaker 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