Three mana Mana Rocks nowadays wont keep up with the speed of the format, unless there are some additional benefits on the table
At only four ink to put down, and with a decent four willpower to keep her on the board in the early game, the benefits of including Belle in your deck far outweigh the costs
Arcbound Ravager's instant speed sacrifice outlet for artifacts makes it so powerful, putting a +1/+1 counter on it for each artifact it consumes
(Remove those cards from your deck before beginning a new game.) Watermark: League of Dastardly Doom Illustrated by Matt Cavotta Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Not Legal Comp
Wizards with good enter effects are excellent here, like Sea Gate Oracle
The Destined Thief may look underwhelming in a vacuum, but the ability to sneak creatures through for damage is actually hugely relevant for Party decks