Umbral Mantle, and Fanatic of Rhonas

Prerequisites

• Umbral Mantle on the battlefield
• Fanatic of Rhonas on the battlefield
• undefined

Steps

1. Activate Fanatic of Rhonas's second ability by tapping it, adding
2. Activate Fanatic of Rhonas using the ability from Umbral Mantle 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