not just 2nd etaqua, you can also use it to counter etaqua, econ, and this card when on your turn, although if activated on attack, the currently attacking monster will still be unable to attack CMIIW.
Also let you do stuff like triggering clowns effect, avoid WoD ATK reduction, etc. But it could also put your monsters in vulnerable position, so its kinda double edged
Anoymous
Lifeless