Twilight Sparkle, Magician

Well, isn't she good...

All things considered, regardless of the situation its hard for her not to be worth the mana, even if she gets killed straight away, you still get to use two abilities, and they waste resources killing her! plus you get a lot of amusing interactions available by using the right cards which can target her! though sadly, that is a bit limited in those colors)

Tasty card anyway, seeing as I have the rest of them, I'm probably going to try and make an AJ card soon...