When is the best time to sell MTG cards?

Question by mystery: When is the best time to sell MTG cards?
I am kind of new at MTG but I love collecting and playing the game. I am wondering when would be the best time to sell my unnecessary playsets, i.e. a 7th Jace, the Mind Sculptor. I have watched the card prices go up and down like the stock market. So, is it better to sell the cards when they are still in Standard rotation or when they are about to revolve out of Standard? Or is there another "best" way to sell my 'unnecessary'

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