Umbral Mantle, and Alena, Kessig Trapper

Prerequisites

• Umbral Mantle on the battlefield
• Alena, Kessig Trapper on the battlefield
• undefined

Steps

1. Activate Alena by tapping it, adding at least
2. Activate Alena 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 red mana