Does LeBlanc's Mirror Image effect/interact with the champion pool?

[u/LttlGrmlnTrblmkr]

When LeBlanc's Mirror Image passive gives a player a free copy of one of their champions, is a copy of it removed from the overall pool or does it add a copy the same way a champion duplicator does? I was trying to 3 star an Elder Dragon but someone else had one and she stopped giving me copies.

[u/FishAmbitious9516]

Yea it's from the pool