I'm going to assume you mean the Basic Tournament meta, as opposed to the other ones or the horror of free battles.
Run Witchblades. Win all day every day. Seriously, I have yet to hear a reason why they should lose to anything in Basic.
Key cards;
Power insanely useful for everything.
Fireball combos with above nicely and you still get your swing.
WitchBlade Armor first reason why they are very strong. Pluses to all their stats, and they keep the Spirit+Attack bonuses. Which they really want for the Fireball from above or...
The Dance of Blades let's see; Usually +4 attack along with +4 defense? Why the heck not!
The above is usually supported with
Assassination,
Favor of the Dawn, or if they feel mean
Magic AttackHope that helps you save cash instead of dumping it into a useless deck. No excuse me, I need to find someone to buy this bridge off me named Tracker.