Okay, if this is the case, how do attachment spells interact with illusions? (@sharpobject)
Say you cast Spirit of the Panda on your illusion, and the illusion gets destroyed from being targeted.
The Rulebook says:
"Some are Ongoing Spells though, which means they stay in play until something says they don’t. Sometimes ongoing spells have “channeling” which means they’ll be destroyed if the hero who cast them leaves play. Other times they say they “attach” to something, and if that something is destroyed the ongoing spell gets discarded too. But if they don’t attach to anything and don’t have channeling, they’ll stick around until something specifically destroys them."
By your reading, the illusion is never around long enough for the attachment to actually attach, right? So "that something it's attached to" is never destroyed. So the ongoing spell should just sit around forever attached to nothing, right?
My reading is that if you target an illusion with SotP, the thing you targeted is destroyed, and the attachment is discarded, because it still knows what it was trying to attach to, and it still sees that that unit has left play.
But Geiger's ability just says you can trash it, then return it to play. Does Geiger really "forget" which unit it targeted just because it left play from dying? Then wouldn't Geiger's ability also "forget" which (non-illusion) unit it targeted when the unit leaves play from being trashed? It seems like if the ability can keep track of a card when it leaves the game entirely (trashed), then it can keep track of it when it's still in the game (albeit the discard pile).
Firehouse is a completely different case, because it specifically says, "If you destroy it this way..." meaning it cares whether the target was killed with fire or just popped from being looked at funny. It's not that the illusion targeted died too early to be registered: it's that it didn't die "in this way."