You need to be rather careful when using this trap.
The requirement is that you must select 2 set spell/trap cards. It doesn't specify only your opponent's.
So what can happen (if you're not careful) is that if you activate it when your opponent only sets 1, this trap card will force you to select one of your own set spell/trap, effectively locking yourself down as well. Locking down 2 of your opponent's set spell/trap can be rather tricky if your opponent uses them often, before you can wait for them to set 2.
I love going first and setting this thing, then seeing the other guy set two cards which 9 times out of 10 are Wall of Disruption and/or Enemy Controller. It's so satisfying to lock down those overused meta cards and just PUNISH.
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