Hostility (CM2) from Commander Anthology Volume II, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Omar Rayyan
• Card Text:
  Haste
  If a spell you control would deal damage to an opponent, prevent that damage. Create a 3/1 red Elemental Shaman creature token with haste for each 1 damage prevented this way.
  When Hostility is put into a graveyard from anywhere, shuffle it into its owner's library.