Umbral Mantle, and Circle of Dreams Druid

Prerequisites

• Umbral Mantle on the battlefield
• Circle of Dreams Druid on the battlefield
• undefined

Steps

1. Activate Circle of Dreams Druid by tapping it, adding at least three mana of any color
2. Activate Circle of Dreams Druid 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