Arbor Elf + New Horizons + Pemmin's Aura

GU identity

Commander legal

The 3 combo pieces

What must be in place

Pemmin's Aura attached to Arbor Elf.
New Horizons attached to a Forest you control.

How to execute it

  1. Activate Arbor Elf by tapping it, untapping the enchanted forest.
  2. Activate the ability granted to the Forest by New Horizons, adding {U}{U}.
  3. Activate Pemmin's Aura by paying {U}, untapping Arbor Elf.
  4. Repeat.
  5. Once you have infinite blue mana, you may tap the Forest for other colors instead of blue, adding infinite colored mana.

What the combo produces