Umbral Mantle, and Elvish Archdruid

Prerequisites

• Umbral Mantle on the battlefield
• Elvish Archdruid on the battlefield
• undefined

Steps

1. Activate Elvish Archdruid by tapping it, adding at least
2. Activate Elvish Archdruid 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