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Target 1 face-up monster on the field; change that target to face-down Defense Position.
This is so old card yet it has so many uses. You can use it to stop your opponent from synchro/xyz summoning. You can chain it to opponent's Effect Veiler/Breakthrough Skill.., flipping your monster face down and avoiding it and gaining your effect. You can simply use it to stop your opponent from attacking. Another option is using it on your flip effect monster while already being flipped face up, gaining flip effect once more on another flip. With this card you can also get over monsters like Vanity's and Majesty's Fiend, Constellar Diamond and Djinn lock... Against Burning Abyss this card is fantastic. You flip one of their monsters face down and all other die, because monsters on his/her side of the field must also be Burning Abyss in order for them to stay alive.