He says "Ikkitousen" (一騎当千), which can be translated as:
- literally: One warrior equals thousand (correct me if I'm wrong ^^)
- matchless warrior
- mighty hero
The way he exposes his sword in front of him makes me think that he rather means the power of his sword...
... or he just means that this time he's a top tier!
And... I have a funny impression he wants to be clearly heard by non-Japanese speakers (LOL)
Well, hear by yourself:
scroll to 08:27