Battles are permanents that are formatted sideways, and you could attack your own battles similarly to how you attack your opponent's planeswalkers, and once you defeat them you get to cast the back side of the card
I never personally had much interest in Olivia Voldaren as a general, simply because I was never drawn to making a tribal vampire deck
Draws cards equal to the number of counters on it, enhancing strategic play
Wizards can also vary in power and toughness
Since the main goal is just to play this time, I felt it would be questionable to prepare an expensive deckor rather, considering the point above, it would be counterproductive
Third of all, it'll tap lock something for two turns like, say, their Commander, triple nice