Hi,
Most of this interaction is already covered in the Gatherer rulings for Opalescence:
This is the current interaction between Humility and Opalescence: The type-changing effect applies at layer 4, but the rest happens in the applicable layers. The rest of it will apply even if the permanent loses its ability before it’s finished applying. So if Opalescence, Humility, and Worship are on the battlefield and Opalescence entered the battlefield before Humility, the following is true: Layer 4: Humility and Worship each become creatures that are still enchantments. (Opalescence). Layer 6: Humility and Worship each lose their abilities. (Humility) Layer 7b: Humility becomes 4/4 and Worship becomes 4/4. (Opalescence). Humility becomes 1/1 and Worship becomes 1/1 (Humility). But if Humility entered the battlefield before Opalescence, the following is true: Layer 4: Humility and Worship each become creatures that are still enchantments (Opalescence). Layer 6: Humility and Worship each lose their abilities (Humility). Layer 7b: Humility becomes 1/1 and Worship becomes 1/1 (Humility). Humility becomes 4/4 and Worship becomes 4/4 (Opalescence).
The bolded section is the relevant part. The effect from Opalescence is dependent on the effect from Enchanted Evening, since applying Enchanted Evening will change what Opalescence applies to, so we apply the Evening first. Since Humility entered the battlefield before the Starfield, we apply Humilty's 1/1 effect first, then we apply the Starfield's effect, so all other enchantments (besides the Starfield) will be creatures with power and toughness equal to their converted mana cost, not 1/1s (and things like lands will be 0/0 creatures and will die). Had the Starfield entered the battlefield first, then Humility, they would survive as 1/1 creatures.
Nathan Long
Magic Rules NetRep