Could be situationally useful. I.e. you have all the momentum and don't really need mirror wall right now, but your opponent might need it to come back. You use this card, banish mirror wall, and now they're sunk.
Well, we can use it to shutdown Kaiba's Twister/EC boner, but if only we had DD Warrior... Btw, could easily be used for other farming situations. (Equips, Field spells, Kuriboh...wait, why haven't I used this for Kuriboh yet? :/ )
just got 2 copy this card. never use it. ithink this card can be good.