So where IS the gateway? Behind Minty of course, whom is pausing to get her picture taken. Can't have posers entering can we? The finish Minty has isn't really on her, it's part of the lighting above her head that attempts to create a mock finish on her body. Of course, since white-colored ponies cannot show this finish, they cannot enter the tunnel (white on white doesn't show at all). Card info:
The Gateway to Pearliness
Normal Spell
Special Summon 1 “My Pearly Pony” monster from your deck or Graveyard.
Random
Secret Rare