So the case, filled with cards, would be roughly the same as a slightly overweight Cocker Spaniel
You can probably swap out Fall of Gil-galad and Oath of the Grey Host for a couple more effects that let you sacrifice your own creatures like Ashnod's Altar, Plumb the Forbidden, Yahenni, Undying Partisan, Yawgmoth, Thran Physician, or Phyrexian Altar, depending on your budget
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One of Giovanni's Team Rocket grunts has a Blastoise, but won't attack with it if he has 3 Water Energy attached
Only one vault was great enough to hold Emrakul
While Cinderella works especially well in decks that focus more heavily on princess characters, she also does let you trigger her effect by just playing her, making her a solid draw/ink engine in-and-of-herself