Ninja Hurricane
Spell
you can only play this card when there is a ninja on the your side of the field.this card destroys all cards on your opponents side of the field without ninja in there name.

Ninjutsu Academy
Field Spell
this card makes it so players have to play ninja cards

Leaf Ninja-Kakashi
warrior
stars:6
2500/2000

Sound Ninja-Orochiamaru
warrior
stars:5
2000/1900

Sand Ninja-Garra
warrior
stars:4
1900/1000

It's a "Ok" card, But it could be worded a little better.

2 Things, 1 It's not worded well, and 2, It's not practical.

They are goood cards but they are all missing one thing............an atribute!

Just about everything you said was correct.

First of all, since there is no type "ninja," you have to say "any card with "ninja" in their name," instead of "ninja cards."

Also, don't say "this card..." blah blah blah. It sounds much better if, for example with ninjustu academy, you say "All monsters on the field must have "ninja" in their name."

And, yes, you didn't include attributes. Monsters need to have an attribute: Fire, Wind, Water, Earth, Dark, or Light. Also, most monsters these days have effects instead of being normal monsters.

Wth? These cards are useless, all you did was create cards with no significance. I'm closing this.

You just made cards with no effects or anything.