Mischief doesn't leave the stack until it's finished resolving, so it's a legal target at the time. So yes, you can redirect a counter onto the misdirect to fizzle it.I have a rules question for the latest episode of Game Knights. Here's what happens (spoiler tagged just in case anyone cares):
P1: Anguished Unmaking
P2: Lapse of Certainty (countering Anguished Unmaking)
P1: Imp's Mischief (targeting Lapse of Certainty)
P1: Imp's Mischief resolves, changes Lapse of Certainty's target to Imp's Mischief
Now as far as I understand, Imp's Mischief isn't a valid target for Lapse of Certainty when it resolves. Or is it still on the stack? Can you misdirect a counter onto the misdirect to effectively counter the counter?