Firing up a new thread (a similar one the OP had some questionable wording in his post that probably killed the thread), so...
Here's my first one:
I've been trying to figure out a way to weaponize Mirror Hideaway and thought up the following (requires a 13th level witch, I suppose):
1. Witch casts Stinking Cloud (L3 spell)
2. Party (aka, the hit squad) wanders in and gets nauseated.
3. One by one (one per round), they wander out and immediately get dinged with a shot from the Witch's Remove Sickness (L1 spell) wand (cast at say level 3-5 for longer duration). Nausea is now suppressed for the duration of the spell.
4. Hit squad steps into the Mirror Hideaway, weapons at the ready.
5. Witch uses Teleport Object to teleport the mirror to a location where his/her target is located (obviously will need to scry or have some idea of where the mirror is going...)
6. Mirror breaks upon arrival (having been moved more than 5 feet) and hit squad is ejected - the 1d6 rounds of nausea effectively suppressed by the Remove Sickness.
7. Hit Squad attacks!
8. Nausea hits sometime after the battle (hopefully) is over as Remove Sickness ends.
Alternately, you could just use the Mirror Hideaway + Teleport Object to deploy your team(s), just don't dump them into a combat zone (because 1d6 rounds of nauseated condition is rather bad).
Sort of like a one-way Star Trek transporter away team, except with extra nausea.