Vadrik, Astral Archmage (DBL) from Innistrad: Double Feature, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Kieran Yanner
• Card Text:
  If it’s neither day or night, it becomes day as Vadrik, Astral Archmage enters the battlefield.
  Instant and sorcery spells you cast cost X less to cast, where X is Vadrik’s power.
  Whenever day becomes night or night becomes day, put a +1/+1 counter on Vadrik.