Each achievement has a certain rank, and reaching it will give you extra Shinedust
Speaking of "more powerful" options, things start to get really spicy on the top-end: $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 $ 0.00 Note: you can play a creature card for it's morph cost then target it with Ghostly Flicker, resulting in a creature that is "turned face-up" when it returns to the battlefield as a new object
That said, even though Wizards of the Coast will be revealing a lot of goodies this afternoon, some new cards are already starting to hit the scene
For the moment, it seems as though Wizards of the Coast will remain conservative on their deployment - Rosewater said they want to see how players respond before hanging their collective hats on this shiny new card type.
It also has a two energy, 50 damage attack and 150 hit points to keep it around and doing damage, meaning players have enough time to set up a Gardevoir on the bench