Fake Trap (DB1-EN164) [Dark Beginning 1]

You can only activate this card when your opponent uses an effect of a Spell, Trap, or Effect Monster to destroy Trap Card(s) on your side of the field. Destroy this card as a substitute of those Trap Card(s) and the other Trap Card(s) are not destroyed. If a Set card(s) would have been destroyed, pick up and see the Set card(s).