Hypothetical: I try to use Program Malfunction to pin down my opponent's Chester's Backing, and they respond by committing that same Chester's Backing to cancel the ability. I then respond with my own Chester's Backing to cancel the ability on their Chester's Backing. What happens?
Does my Chester's Backing successfully cancel theirs, and allow Program Malfunction's ability to continue?
Or is my opponent's Chester's Backing no longer a valid target for Program Malfunction at this point, because it is now committed?
Thanks in advance.
-Tuggs