Activate Arbor Elf by tapping it, untapping the enchanted forest.
Activate the ability granted to the Forest by Nature's Embrace, adding {U}{U}.
Activate Freed from the Real 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

Freed from the Real

Nature's Embrace

Activate Arbor Elf by tapping it, untapping the enchanted forest.
Activate the ability granted to the Forest by Nature's Embrace, adding {U}{U}.
Activate Pemmin's Aura 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.

Pemmin's Aura

Activate Order of Whiteclay by tapping it, adding {W}{W}.
Activate Order of Whiteclay by paying {1}{W}{W} and untapping it, returning a creature card with mana value three or less from your graveyard to the battlefield.
Activate Ashnod's Altar by sacrificing the creature, adding {C}{C}.
Repeat.

Infinite colorless mana

Infinite death triggers

Infinite creature ETB

Infinite landfall triggers

Infinite creature LTB

Infinite creature sacrifice triggers

Order of Whiteclay

Ashaya, Soul of the Wild

Ashnod's Altar

Combos with "Nature's Embrace"