Activate Arbor Elf by tapping it, untapping the enchanted forest.
Activate the Forest by tapping it, adding {U}{G}.
Activate Freed from the Real by paying {U}, untapping Arbor Elf.
Repeat.

Infinite colored mana

Arbor Elf

Freed from the Real

Verdant Haven

Activate the enchanted land by tapping it, adding {1}.
Verdant Haven triggers, adding an additional {1}.
Activate Earthcraft by tapping an untapped creature, untapping the enchanted land.
Activate Marath by paying {1} and removing a +1/+1 counter from it, creating a 1/1 Elemental token.
Repeat until Marath has no more +1/+1 counters.
Marath dies due to having 0 toughness and goes to the command zone.
Cast Marath by paying {R}{G}{W} plus commander tax, leaving zero mana unspent.
Marath enters the battlefield with a number of +1/+1 counters equal to the amount of mana spent.
Repeat any number of times.

Combos with "Verdant Haven"