Activate Arbor Elf by tapping it, untapping the enchanted Forest.
Activate the ability granted to the Forest by the Aura, adding {G}.
The triggered ability from the Aura triggers, adding an additional {U}.
Activate the Aura attached to Arbor Elf by paying {U}, untapping Arbor Elf.
Repeat.
Once you have infinite blue mana, you may tap the Forest for other colors instead of blue, adding infinite colored mana.

Infinite colored mana

Arbor Elf

Blighted Burgeoning

Freed from the Real

Activate Arbor Elf by tapping it, untapping the enchanted Forest.
Activate the Forest by tapping it, adding {G}.
The triggered ability from the Aura triggers, adding an additional {U}.
Activate the Aura attached to Arbor Elf by paying {U}, untapping Arbor Elf.
Repeat.
Once you have infinite blue mana, you may add other colors in step 3.

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