Sunbird's Invocation (XLN) from Ixalan, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Christine Choi
• Card Text:
  Whenever you cast a spell from your hand, reveal the top X cards of your library, where X is that spell's converted mana cost. You may cast a card revealed this way with converted mana cost X or less without paying its mana cost. Put the rest on the bottom of your library in a random order.