O-Kagachi is in this weird spot where there's much better beaters at 6 mana (heck, Territorial Hellkite is a better beater at 4) and there's much better rattlesnakes at much less mana, such as Karmic Guide, Soul Snare, even Seal of Primordium
It gives all your legendary and artifact spells flash, and doubles up any enter or leave-the-battlefield triggers from them
The Pokmon anime is entertaining, but watching it isnt going to improve anyones skills at the trading card game
The similarity in the names is just a coincidence
Fetch lands, or other lands that allow you to search your deck, are also especially helpful since a 99-card deck needs to be thinned out a lot more than a 60-card one
Her true value comes from her ability, however, which relies on you having other Knight cards in play