The Stone Warder archetype for Sorcerer includes:
Power of Stone (Su)
A stone warder draws power from natural rock, and gains a +1 bonus to her caster level when in hills, mountains, or underground terrain. This bonus increases to +2 at 5th level, and by an additional 1 every 5 sorcerer levels thereafter. However, this strong elemental tie prevents a stone warder from casting spells that have the air, cold, electricity, fire, or water descriptor.
Emphasis added. Would taking a spell with the denied descriptors, but casting it with the [earth] tag, be a valid choice or am I barred from selecting any of these spells?
For example, the Elemental (earth) Bloodline Arcana allows me to "Whenever you cast a spell that deals energy damage, you can change the type of damage to match the type of your bloodline. This also changes the spell’s type to match the type of your bloodline." and the Elemental Spell metamagic has similar wording. Would I be able to take Fireball as a spell and cast it as Evocation [earth]?