Damaged copies start at $11, but you're going to run into some more expensive listings for NM, with the top end of the range hitting roughly $57
Even discounting the Knight tribal subtheme of March of the Machine , the card's front side is basically Finale of Glory
Card grading is when a professional service checks the condition and authenticity of your trading cards
This does stop a token deck from completely ending the game, but it does allow for some creature/player control
However, there are potentially better cards like Revitalize, which also costs 2 mana but provides instant speed life gain and card draw without the need for a specific color requirement, making it more versatile in different deck archetypes
Some popular Commanders that are particularly adept at abusing Cloud Cover are Tameshi, Reality Architect, and Brago, King Eternal