Aquatic Incursion (RIX) from Rivals of Ixalan, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Jason Rainville
• Card Text:
  When Aquatic Incursion enters the battlefield, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.)
  3U: Target Merfolk can't be blocked this turn.