Arbor Elf, Pemmin's Aura, and Regal Behemoth

Prerequisites

• Arbor Elf on the battlefield
• Pemmin's Aura on the battlefield
• Regal Behemoth on the battlefield

Steps

1. Activate a Forest by tapping it, adding
2. Regal Behemoth's last ability triggers, adding
3. Activate Arbor Elf by tapping it, untapping a Forest
4. Activate Pemmin's Aura's first ability by paying , untapping Arbor Elf
5. Repeat

Results

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