Why is this card a Super Rare when it's so weak? Is it effective any decks?"
Exactly right. I think this was konami's way to make us waste gems/money with the chance of getting this as a useless SR instead of getting a good one. Sure, it may be good for destroying a facedown monster that your opponent may trap you with, but apart from that, the card is too weak to be of any use.
@666 illunimata confoi I agree, a wall of shadow facedown with it's 3000 defense is fierce,but Nothing in comparison to my dad. He'll run a mini sword straight throw that wall. Be like," that was it?"-Samurai_Sasuke
Samurai_Sasuke:"I thought the Trump tower could not break." Lol!
It will be like David and Goliath all Over Again. Roflmao!
This card should get additional 4500 atk when declare attack, just like in naruto anime