Card advantage is a strategic concept (rather than a specific game term) and a lot broader, and basically means having more cardboard than my opponents. For starters, any card that puts more cards in your hand is card advantage, even if it doesn't say draw. But card advantage also looks at what happens in other zones
While it hasn't made too many waves in the tournament scene (although for a brief, glorious moment before Reflector Mage was banned, people were playing it at the Grand Prix level in Standard with some success), it's one of the best "build around" cards in both Standard and Modern
You can even sacrifice it to gain three life, which makes it good in a pinch
Ive written about a variety of commanders, such as an ode to my favorite novel series growing up, Redwall, several Rube Goldberg combo commanders, and even an Unsummon-loving waifu
Though she only has 2 Strength and 4 Willpower, plus 2 points of Lore, she has a similar bonus to Snow White, in that she makes use of a specific subtype to bolster your cards