Sometimes this is done during the upkeep, or in response to card draw, in case your opponent draws a split second card (say, Krosan Grip for your Icy Manipulator), countermagic, or an untargetability effect, but in general it's best to wait until the last moment
From the experience of being the person who originally wrote up the post regarding rule 4, we tried to make it clear that variations of some of the listed words were considered bad as well, considering we all know the words themselves aren't dangerous, but rather their societal connotations
Let's take a look at some of these fantastic rides and how you can make the most of them in your next Commander game
Some popular Commanders that are particularly adept at abusing Cloud Cover are Tameshi, Reality Architect, and Brago, King Eternal