My question is basically how much is keeping your opponent in the dark worth? The most simple example is with Zaladar. You used your ability and have 0-2 SE left with a Shadow Font in your hand and nothing else to play should you play it so that you will not need to next turn or hold on to it in order that your opponent will not know you can use your ability next turn? Another example would be using a strange build so that your opponent won't know your strategy and will sac the wrong cards.