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The ability to play early Mantis Rider or Reflector Mage coupled with the creature's ability to collect counters from Thalia's Lieutenant makes it an ideal T1 play in the absence of an ther Vial
Its been around for a long time, seen plenty of reprints, and still sees some play
Source: Most spoilers coming directly from Wizards, or other authorized spoilers we get nice full sized images that are clear and easy to read
All Treasure Making Discard to Draw Stuff There are a huge number of discard one, draw two, and then make Treasure tokens for future ramping and casting things that are great to add to your deck, especially in Highlander formats like Commander where you can run them all in the same deck
One of my all-time favorite planeswalker for this deck -- and any Dimir deck really -- has to be Ashiok, Dream Render