Saw this odd case come up at a meetup yesterday. Runner is playing Apex vs. Skorpios. They trash a face-up Harbinger to use Endless Hunger. Can the corp RFG Harbinger, or does it get turned face down?
My reading is that both Skorpios and Harbinger are replacement effects for the "being added to the heap" portion of card trashing, so on the runner's turn, that effect is replaced by Harbinger and cannot be replaced again by Skorpios. Does that jive?
When Harbinger is trashed, install it facedown instead of adding it to your heap.
Whenever a Runner card is trashed (from any location), you may force the Runner to remove it from the game instead of adding it to the heap. Use this ability only once per turn.
UFAQ for Skorpios + clone chip:
If the Corp uses Skorpios Defense Systems to remove a Clone Chip from the game when the Runner uses it, does the Runner still get to install a program from their heap or has the cost been prevented?
Yes, the Runner still installs a program from their heap. Skorpios replaces the Clone Chip entering the heap with being removed from the game, it doesn’t replace the trash event; thus, the cost has been paid and the ability triggers.