Celestial Archon

A spell with bestow is either a creature spell or an Aura spell. It's never both. Similarly, a permanent with bestow is either a creature or an Aura, but not both.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a bestow cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell remains unchanged, no matter what the total cost to cast it was.

Auras attached to a creature don't become tapped when the creature becomes tapped. Except in some rare cases, an Aura with bestow remains untapped when it becomes unattached and becomes a creature.