Now you don't. [spell/d20 Modern]

[Dhavaer]

Disappear
Illusion
Level: Arcane 1; Components: S; Casting Time: 1 swift action; Target: Self; Duration: Instantaneous

Upon casting this spell, you may make a hide check regardless of any observers. You still require concealment or cover.

[Fizban]

So 1 swift action+1st level spell = standard action and opposed bluff check?

[Dhavaer]

Sounds about right. You can make Bluff checks all day, after all.