Hostility is a rare Creature — Elemental Incarnation card from Commander Anthology Volume II (CM2), collector number 105. Current market price: $0.24, TCGplayer market prices via Scryfall.
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.