You do not want to side out Warping Wail in the mirror. It kills opposing Mimics (or if against White Eldrazi, kills like 1/2 of their creatures). You can side out Null Rod in the unpowered "JacoDrazi" mirror for more removal, but you're honestly not that likely to face it.
My latest list has cut another Matter Reshaper for another Crucible main. I'm working on finishing up a very long piece for publication hopefully early this week that will be on EC.