The usual case of this are families of monster trios which all share the same sprites, but their differing palettes can help indicate their power rank from a glance
It allows you to look at and play the top card of your library at any time, and you pay life rather than pay the mana for spells you cast this way
The card's only real drawback is that if you flip it in combat, you won't get the first trigger from Holy Frazzle-Cannon until the next turn, which makes it a lot worse than something like Invasion of Gobakhan
And Roxanne, Starfall Savant is her name
Id also include cards like Titanic Ultimatum or Unnatural Growth that are going to make your creatures more powerful and make it easier to deal at least some combat damage
Just like with LotR, players can really feel the world of Final Fantasy when they look at, or play with, the cards from Final Fantasy