Obsessive Astronomer (DBL) from Innistrad: Double Feature, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Josu Hernaiz
• Card Text:
  If it's neither day nor night, it becomes day as Obsessive Astronomer enters the battlefield.
  Whenever day becomes night or night becomes day, discard up to two cards, then draw that many cards.