Crown of Fury is a common Enchantment — Aura card from Onslaught (ONS), collector number 196. Current market price: $0.18 (foil $0.63), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+0 and has first strike. Sacrifice this Aura: Enchanted creature and other creatures that share a creature type with it get +1/+0 and gain first strike until end of turn.