Creature - Faerie Wizard
When Rusecharm Nyx enters the battlefield, another target creature loses all abilities and becomes 1/1 for as long as you control Rusecharm Nyx.
Sort of unoriginal, since it's a lot like a smaller Dungeon Geists. But it fits the theme of the second set of the Eldangard block quite nicely. The first set revolved around tokens, and the second set has a "vanilla matters" subtheme that intertwines with it. Green, White and Red generally like vanilla creatures. Blue and Black don't exactly hate them, but they interact with the theme in a generally negative way. Like this!
Added bonus: Once it gets flavor text (or I give up and print it as-is), this marks the completion of Stormfront! The previous card in the "Rare small blue creature" slot was cut from the set at the last minute (I just wasn't happy with it) and I had to find a replacement. I'm pretty satisfied with how it turned out.