Arbor Elf + Freed from the Real + Market Festival

Arbor Elf
Freed from the Real
Market Festival

Requires
All permanents on the battlefield. Freed from the Real attached to Arbor Elf. Market Festival attached to a Forest you control.
Steps
  1. Activate Arbor Elf by tapping it, untapping the enchanted forest
  2. Activate the Forest by tapping it, adding ug and one mana of any color
  3. Activate Freed from the Real by paying u, untapping Arbor Elf
  4. Repeat
Results
Infinite colored mana.