You have enough mana to cast the Ally in your hand.
Steps
Cast the Ally by paying its mana cost.
When the Ally enters as a Forest due to
Ashaya,
Haru triggers, earthbending the Ally.
Activate the Ally by tapping it, adding ({G} magic symbol) .
Activate
Food Chain by exiling the Ally, adding an amount of mana of any color equal to the Ally's mana value plus one that can only be spent to cast creature spells.
Haru triggers, returning the Ally from exile to the battlefield.
Repeat from step 2.
Results
Infinite LTB.
Infinite ETB.
Infinite green mana.
Infinite landfall triggers.
Infinite colored mana that can only be spent to cast creature spells.