Disney Lorcana will use a cold foil treatment for its cards, with different patterns meant to match the actual backgrounds and layers of the cards
You shouldn't hold your breath on too many other Alicorns in the future, or Ponies for that matter, considering Bill the Pony was lumped in with the rest of normal horsedom
The Shift ability on their card lets them be played for an alternate cost, on top of one of your other characters
The other main reason is that it stops your opponent from flashing in a creature or getting value out of their death triggers on cards like Heartfire Hero
Returning Mechanic: Face-Down Cards Returning Mechanic: Disguise Returning Mechanic: Cloak Assassins are well-trained in hiding, blending, and various other forms of social stealth
Most cards have white, silver, or black borders