Jinzo

Jinzo is one of the most feared cards to face in a Tournament. He automatically negates every Trap Card in play, both on your side of your field, and his, unless he is equipped with the Amplifier Equip Spell Card, in which case, Whomever controls Jinzo, also regains the ability to Activate his/her own Trap Cards. However, when Amplifier is equipped, all the opponent has to do is Destroy Amplifier with Mystical Space Typhoon, or another card that destroys Spell Cards, to destroy Jinzo.

Jinzo is perhaps the sole reason (Royal Decree could be countered by Dust Tornado), why people in a Tournament don't use a deck that contains nothing but Trap Cards. Jinzo is vunerable to Double Snare, Solemn Judgment, and Horn of Heaven.