Shared Animosity is a rare Enchantment card from Wilds of Eldraine: Enchanting Tales (WOT), collector number 49. Current market price: $4.15 (foil $13.36), TCGplayer market prices via Scryfall.
Whenever a creature you control attacks, it gets +1/+0 until end of turn for each other attacking creature that shares a creature type with it.