Activate Arbor Elf by tapping it, untapping the enchanted forest.
Activate the ability granted to the Forest by New Horizons, 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

New Horizons

Activate the land with New Horizons attached by tapping it, adding two mana of any color.
Activate Silvanus's Invoker by paying {1}, untapping the land and causing it to become an 8/8 Elemental with trample and haste in addition to its other types until end of turn.
Repeat.

Infinite mana lands you control can produce

Infinite power and toughness for most creatures you control until end of turn

Infinite untap of lands you control

Agatha of the Vile Cauldron

Silvanus's Invoker

Activate Dryad Arbor by tapping it, adding {U}{U}.
Activate Freed from the Real's second ability by paying {U}, untapping Dryad Arbor.
Repeat.

Dryad Arbor

Activate Dryad Arbor by tapping it, adding {U}{U}.
Activate Pemmin's Aura's first ability by paying {U}, untapping Dryad Arbor.
Repeat.

Pemmin's Aura

Activate Questing Phelddagrif by tapping it, adding {G}{G}.
Activate Questing Phelddagrif's first ability by paying {G}, giving it +1/+1 until end of turn and causing an opponent to create a 1/1 Hippo creature token.
The Hippo enters the battlefield, triggering Suture Priest's second ability, causing the opponent to lose 1 life.
Activate Questing Phelddagrif by paying {1} and putting a -1/-1 counter on it, untapping it.
Repeat.

Combos with "New Horizons"