The requirement of a damaged character to activate an ability that also requires you to exert her, alongside just 3 Willpower, Lady Tremaine is easily at the bottom of this list
She provides both the go-wide token strategy and the go-tall commander damage threat all in one efficient three-mana package
Double-faced cards show transformations or key moments, like Kefka, Court Mage/Kefka, Ruler of Ruin, Sephiroth, Fabled SOLDIER/Sephiroth, One-Winged Angel, or Clive, Ifrits Dominant/Ifrit, Warden of Inferno
That could really change with the revelation of Magica De Spell
A standard Magic cards weight (on my scale) around 1.73 g the variation is usually in the order of 0.02g
Looking at some other images from the official site you can see a little more of Bolt with the leaves in the art design