1 Chaos Dragon Levianeer Unlike most traditional CHAOS Monsters, "Chaos Dragon Levianeer" requires 3 Monsters to be used to summon it, and it can be any combination of Light and Dark Monsters
Since they are making sure each Bundle and Prerelease has at least three, they look to be fairly common and central to the mechanics of the whole Set
These cards also showcase an innovative design in which only the Mewtwo is holographic
And if they cast a second spell, you create a 2/2 Knight token, giving you board presence over time
Sure, it works well with Sheltered by Ghosts and Ethereal Armor, but it may not be flashy enough to make waves in Commander
Sorry for the poor resolution, the card images were taken from a photo of the poster collection