Faerie Impostor getting killed w/ trigger on the stack
                
                    
                    
                    You can still return a creature to your hand.
"Do  unless you do " offers a choice: you may do  or not do it. If you don't do , then you do . As a result, it doesn't matter whether you can do  or not; the choice is whether you do .
Daniel Kitachewsky
L3, Paris, France
Rules Netrep