Arbor Elf, Utopia Sprawl, and Pemmin's Aura

Prerequisites

• Arbor Elf on the battlefield
• Utopia Sprawl on the battlefield
• Pemmin's Aura on the battlefield
• Arbor Elf does not have summoning sickness
• "Blue" chosen with Utopia Sprawl

Steps

1. Activate the Forest Utopia Sprawl is attached to by tapping it, adding or any color it can produce
2. Utopia Sprawl's last ability triggers, adding Activate Arbor Elf by tapping it, untapping the Forest
3. Activate the Aura by paying , untapping Arbor Elf
4. Repeat

Results

• Infinite green mana
• Infinite mana Forests you control can produce