Use this card with "Mind Crush" and "D.D. Designator" to get rid of dangerous cards in your opponent's hand. Beware, since you also have to reveal your hand, your opponent can use the same strategy against you.
This card is effective against a Koa'ki Meiru deck. Since your opponent is forced to permanently show his/her hand, S/he cannot reveal any cards to you in order to satisfy the costs of keeping Koa'ki Meiru monsters on the field, and must either discard an "Iron Core of Koa'ki Meiru" or destroy the monsters.
This card may have some uses in an Infernity deck, since you would have no cards in your hand most of the time so your opponent is the only one revealing his/her hand.