Guerrilla Tactics (8ED) from Eighth Edition, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Ron Spencer
• Card Text:
  Guerrilla Tactics deals 2 damage to target creature or player.
  When a spell or ability an opponent controls causes you to discard Guerrilla Tactics from your hand, Guerrilla Tactics deals 4 damage to target creature or player.