Clamor Shaman (RNA) from Ravnica Allegiance, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Tomasz Jedruszek
• Card Text:
  Riot (This creature enters the battlefield with your choice of a +1/1+ counter or haste.)
  Whenever Clamor Shaman attacks, target creature an opponent controls can’t block this turn.