I have a Clone Chip, Magnum Opus, Gordian Blade and Sharpshooter in play and Crescentus in my heap. I have no extra memory, so no MU available. I encounter an Archer (so I'm in 3.1). Can I break the Archer with Sharpshooter (trashing it and freeing up 1 MU), and then Clone Chip my Crescentus and derez Archer? Yes, you can install the Crescentus and derez the Archer since you are still in the same timing window.